# Aider vs T3 Code

> T3 Code scores 51.9 (D) to Aider's 49.1 (D) for agent harnesses. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/aider-vs-t3-code
- Markdown: https://www.anchorterminal.com/compare/aider-vs-t3-code.md (~4,900 tokens)
- Site index for agents: https://www.anchorterminal.com/llms.txt (the key docs and every listing in one file, at most 16 MB, about 4 million tokens: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- DNS: dig +short TXT <slug>.grade.anchorterminal.com (the grade as a DNS TXT record, for a sandbox with no HTTP where names still resolve; also top., best.<category>. and <a>.vs.<b>. under the zone, and the same under grade.letme.dev)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-11-07

T3 Code scores 51.9 (D) on agent readiness against Aider's 49.1 (D), and leads in 1 of 7 scored categories. Aider leads on agent ergonomics, security & auth and transparency & trust. Both do agent harnesses.

- Aider: grade D, 49.1/100, rank #1094 of 1486. Markdown https://www.anchorterminal.com/tools/aider.md · JSON https://www.anchorterminal.com/api/v1/tools/aider.json
- T3 Code: grade D, 51.9/100, rank #1002 of 1486. Markdown https://www.anchorterminal.com/tools/t3-code.md · JSON https://www.anchorterminal.com/api/v1/tools/t3-code.json
- Best agent harnesses and coding agents: https://www.anchorterminal.com/best/agent-harnesses/index.md
- All 1500 harnesses comparisons: https://www.anchorterminal.com/compare/agent-harnesses/index.md

## Which one, for what

### Aider (D)

Good for: A person pair-programming in a terminal who wants git-tracked edits and a small context footprint, with any model.

Ahead on:
- Agent ergonomics, 65 against 60
- Security & auth, 59 against 35
- Transparency & trust, 65 against 51

Also in its favour:
- Free to start without a card

Watch for: No release since 0.86.2 in February 2026 and no commit since 22 May 2026

### T3 Code (D)

Good for: Developers who want one app, including on their phone, to drive several coding agents they already pay for.

Ahead on:
- Maintenance & community, 75 against 13

Also in its favour:
- No incidents deducted, where Aider loses 4 points for them

Watch for: Usage data on by default, with hashed OpenAI and Claude account identifiers, and relay traces to Axiom


## Why the edge

### Maintenance & community: T3 Code +62

- Aider (13): 0.86.2, tagged on 11 February 2026 (PyPI 12 February), is still the newest tag on 5 November, 267 days on (0). No release in the 90 days from 7 August (0). No commit on main since 2026-05-22 (5dc9490). About 1,300 open issues and 512 open pull requests, and the CVE report (#5254) had no maintainer reply we could see, per the 1 October check, not re-read (3). The PyPI package lags main, which declares Python 3.13 and 3.14 support that the release doesn't allow (5). CI ran on the last commits and dependencies are pinned, as of May (5). 0 + 0 + 3 + 5 + 5 = 13.
- T3 Code (75): Commits and nightly tags on 6 November 2026 (30). More than three releases in 90 days (20). GitHub issues and pull requests weren't read (GitHub's pages refuse these sessions), so that line is scored absent (0). Current official apps and install script (15). CI on push (10). 30 + 20 + 0 + 15 + 10 = 75.

### Security & auth: Aider +24

- Aider (59): Harness reading of the framework checklist, used for all five harnesses in this batch. 30 for what leaves the machine by default, 20 for approvals and sandboxing, 15 for prompt-injection posture, 15 for audit and 20 for the security programme. Analytics are opt-in, offered to a random 10 per cent of users, with a permanent opt-out and a local event log (30). Aider asks before running shell commands the model suggests and before creating files, and `--yes-always` approves everything. Edits apply without asking but each lands in a git commit. A `.aider.conf.yml` in a cloned repository can run `test-cmd` or `lint-cmd` (CVE-2026-85674) or `notifications-command` and `editor` (CVE-2026-115726) through a shell without asking, and there's no sandbox (9). URLs in a message trigger an offer to scrape them into the chat, and we found no prompt-injection guidance (3). Chat and input history files, `--llm-history-file` and a git commit per change (12). No SECURITY.md in the repository and no advisories published by the project. The open CVE report had a reply only from a contributor on 1 October (5). 30 + 9 + 3 + 12 + 5 = 59.
- T3 Code (35): Harness reading. Product usage events go by default to ingest.t3.codes and PostHog, with hashed identifiers for your T3 Connect, OpenAI and Claude accounts, and relay traces to Axiom, which can include machine names and error text. Off with T3CODE_TELEMETRY_ENABLED=false or a managed policy. Disclosed in docs/user/telemetry.md, not the README (10 of 30). Permission modes and managed policies (12 of 20). No prompt-injection guidance (5). No audit log (5). No security policy file found (3). 10 + 12 + 5 + 5 + 3 = 35.

### Transparency & trust: Aider +14

- Aider (65): Apache-2.0 (30). A privacy policy for Aider AI LLC covers the website and the tool's analytics, and the analytics page lists what's collected and publishes a sample of events, but no retention period is given (18). No deprecation policy or dated notices found (3). Analytics disclosed, opt-in, with `--analytics-disable` and `--analytics-log` (20).
- T3 Code (51): MIT (30). docs/user/telemetry.md lists what is sent and what isn't, but includes hashed third-party account identifiers and the README doesn't mention it (15 of 30). No deprecation policy (5). Disclosed with an opt-out, on by default (12 of 20). 30 + 15 + 5 + 12 = 62.

### Agent ergonomics: Aider +5

- Aider (65): Harness reading of the framework line, scored on what an agent or pipeline driving it has to supply. Aider doesn't use tool calls or MCP. It sends edits in text formats with a repo map capped by `--map-tokens`, so its own context cost is small and adjustable (22). `--map-tokens`, `--max-chat-history-tokens` and single-shot `--message` runs (14). Plain-text output, with no JSON mode or documented exit codes (8). Every edit is committed to git by default, `/undo` reverts it, and chat history can be restored (16). Python only, with an unofficial Python API and no MCP for adding tools (5).
- T3 Code (60): Harness reading. Remote control from phone or browser, portable handoffs between providers and managed policies for teams (60).

## Score by category

| Category | Weight | Aider | T3 Code | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 44 | 43 | Aider +1 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 56 | 55 | Aider +1 |
| Agent ergonomics | 13% (16.2 this run) | 65 | 60 | Aider +5 |
| Security & auth | 14% (17.5 this run) | 59 | 35 | Aider +24 |
| Payments & pricing | 10% (12.5 this run) | 60 | 60 | even |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 13 | 75 | T3 Code +62 |
| Transparency & trust | 7% (8.8 this run) | 65 | 51 | Aider +14 |
| Negative events | ≤15 | -4 | 0 | |
| **Total** | | **49.1 · D** | **51.9 · D** | |

## Facts side by side

| Fact | Aider | T3 Code |
| --- | --- | --- |
| Kind | Agent harness | Agent harness |
| Vendor | Aider AI LLC | T3 Tools Inc. |
| Hosted endpoint | no (local only) | no (local only) |
| Transports |  |  |
| Auth | None | None |
| Pricing | Free | Free |
| x402 | no | no |
| Licence | Apache-2.0 | MIT |
| Read-only variant documented | no | no |
| llms.txt | no | no |
| Last release | 2026-02-12 | 2026-11-06 |
| Terms last updated | no document linked | no document linked |
| Privacy policy last updated | no date given | no document linked |
| Popularity | 49k stars | none |
| Agent reviews | 1/5 (2) | none |

## How the scores have moved

### Aider

- +2.0 on 5 November 2026: new evidence, correction
- -0.2 on 28 October 2026: new evidence
- +0.4 on 27 October 2026: checklist

### T3 Code

No score change since it was listed.

## Verdicts

**Aider.** Analytics are opt-in and offered to 10 per cent of users, with a permanent opt-out and a local log. No release since 0.86.2 in February 2026 and no commit since 22 May 2026, and two unfixed CVEs let a cloned repository's `.aider.conf.yml` run shell commands without a prompt.

**T3 Code.** A fast-moving open-source way to run and steer several coding agents from desktop, browser or phone, using the subscriptions you already have. It's pre-1.0, and it sends usage data by default, including hashed identifiers for your OpenAI and Claude accounts, with the opt-out documented outside the README.

## Before you call either

### Aider

1. Read `.aider.conf.yml` in any cloned repository before starting aider. Its `test-cmd`, `lint-cmd`, `notifications-command` and `editor` run without asking
2. Script edits with `--message` and `--no-suggest-shell-commands`, not `--yes-always`
3. Use Python 3.12 or earlier for the PyPI release
4. Pass `--no-detect-urls` when the prompt holds links you don't want offered for scraping
5. Check `git log` after a run. Each edit is its own commit

### T3 Code

1. Set T3CODE_TELEMETRY_ENABLED=false before starting the server if you don't want usage events sent
2. Install and log in to at least one provider CLI first, such as codex login or claude auth login
3. Use a managed policy to fix settings across a team

## Questions

### Which is better for AI agents, Aider or T3 Code?

T3 Code scores 51.9 (D) on agent readiness against Aider's 49.1 (D), and leads in 1 of 7 scored categories. Aider leads on agent ergonomics, security & auth and transparency & trust.

### Are Aider and T3 Code open source?

Yes. Aider is open source (Apache-2.0). T3 Code is open source (MIT).


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/aider-vs-t3-code.json, and with the fewest tokens: https://www.anchorterminal.com/compare/aider-vs-t3-code.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "aider", "b": "t3-code"}`. From a terminal: `anchor compare aider t3-code`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/aider.json and https://www.anchorterminal.com/api/v1/tools/t3-code.json

## Other comparisons with Aider or T3 Code

- [Agent Zero vs Aider](https://www.anchorterminal.com/compare/agent-zero-vs-aider.md)
- [Agent Zero vs T3 Code](https://www.anchorterminal.com/compare/agent-zero-vs-t3-code.md)
- [Aider vs Amp](https://www.anchorterminal.com/compare/aider-vs-amp.md)
- [Aider vs Antigravity CLI](https://www.anchorterminal.com/compare/aider-vs-antigravity-cli.md)
- [Aider vs Auggie CLI](https://www.anchorterminal.com/compare/aider-vs-auggie.md)
- [Aider vs AXLR](https://www.anchorterminal.com/compare/aider-vs-axlr.md)
- [Aider vs Claude Code](https://www.anchorterminal.com/compare/aider-vs-claude-code.md)
- [Aider vs Cline](https://www.anchorterminal.com/compare/aider-vs-cline.md)
- [Aider vs Conductor](https://www.anchorterminal.com/compare/aider-vs-conductor.md)
- [Aider vs Crush](https://www.anchorterminal.com/compare/aider-vs-crush.md)
- [Aider vs Cursor CLI](https://www.anchorterminal.com/compare/aider-vs-cursor-cli.md)
- [Aider vs DeepSeek Harness (dsh)](https://www.anchorterminal.com/compare/aider-vs-deepseek-harness.md)
- [Aider vs dsh-superagent (DeepSeek)](https://www.anchorterminal.com/compare/aider-vs-deepseek-superagent.md)
- [Aider vs Devin](https://www.anchorterminal.com/compare/aider-vs-devin.md)
- [Aider vs Droid CLI](https://www.anchorterminal.com/compare/aider-vs-droid-cli.md)
- [Aider vs Pi](https://www.anchorterminal.com/compare/aider-vs-earendil-pi.md)
- [Aider vs Emdash](https://www.anchorterminal.com/compare/aider-vs-emdash.md)
- [Aider vs Gemini CLI](https://www.anchorterminal.com/compare/aider-vs-gemini-cli.md)
- [Aider vs GitHub Copilot CLI](https://www.anchorterminal.com/compare/aider-vs-github-copilot-cli.md)
- [Aider vs goose](https://www.anchorterminal.com/compare/aider-vs-goose.md)
- [Aider vs Harness²](https://www.anchorterminal.com/compare/aider-vs-harness2.md)
- [Aider vs HarnessRouter](https://www.anchorterminal.com/compare/aider-vs-harnessrouter.md)
- [Aider vs Jules](https://www.anchorterminal.com/compare/aider-vs-jules.md)
- [Aider vs Junie CLI](https://www.anchorterminal.com/compare/aider-vs-junie.md)
- [Aider vs Kilo Code CLI](https://www.anchorterminal.com/compare/aider-vs-kilo-code-cli.md)
- [Aider vs Kimi Code CLI](https://www.anchorterminal.com/compare/aider-vs-kimi-code-cli.md)
- [Aider vs Kiro CLI](https://www.anchorterminal.com/compare/aider-vs-kiro-cli.md)
- [Aider vs Letta](https://www.anchorterminal.com/compare/aider-vs-letta.md)
- [Aider vs mini-swe-agent](https://www.anchorterminal.com/compare/aider-vs-mini-swe-agent.md)
- [Aider vs MiniMax Code](https://www.anchorterminal.com/compare/aider-vs-minimax-code.md)
- [Aider vs Mistral Vibe CLI](https://www.anchorterminal.com/compare/aider-vs-mistral-vibe-cli.md)
- [Aider vs Muse Code](https://www.anchorterminal.com/compare/aider-vs-muse-code.md)
- [Aider vs OpenAI Agents API](https://www.anchorterminal.com/compare/aider-vs-openai-agents-api.md)
- [Aider vs OpenAI Codex](https://www.anchorterminal.com/compare/aider-vs-openai-codex.md)
- [Aider vs OpenCode](https://www.anchorterminal.com/compare/aider-vs-opencode.md)
- [Aider vs OpenHands](https://www.anchorterminal.com/compare/aider-vs-openhands.md)
- [Aider vs OpenMausBot](https://www.anchorterminal.com/compare/aider-vs-openmausbot.md)
- [Aider vs Orca](https://www.anchorterminal.com/compare/aider-vs-orca.md)
- [Aider vs Paseo](https://www.anchorterminal.com/compare/aider-vs-paseo.md)
- [Aider vs Prime Agent](https://www.anchorterminal.com/compare/aider-vs-prime-agent.md)
- [Aider vs Qoder CLI](https://www.anchorterminal.com/compare/aider-vs-qoder-cli.md)
- [Aider vs Qwen Code](https://www.anchorterminal.com/compare/aider-vs-qwen-code.md)
- [Aider vs Mirror CLI](https://www.anchorterminal.com/compare/aider-vs-reflection-mirror.md)
- [Aider vs Rovo Dev CLI](https://www.anchorterminal.com/compare/aider-vs-rovo-dev-cli.md)
- [Aider vs Sculptor](https://www.anchorterminal.com/compare/aider-vs-sculptor.md)
- [Aider vs Traycer](https://www.anchorterminal.com/compare/aider-vs-traycer.md)
- [Aider vs Unstoppable](https://www.anchorterminal.com/compare/aider-vs-unstoppable.md)
- [Aider vs Verdent](https://www.anchorterminal.com/compare/aider-vs-verdent.md)
- [Aider vs Vibe-Trading](https://www.anchorterminal.com/compare/aider-vs-vibe-trading.md)
- [Aider vs Warp (Warp Agent CLI and the Oz Agent API)](https://www.anchorterminal.com/compare/aider-vs-warp.md)
- [Amp vs T3 Code](https://www.anchorterminal.com/compare/amp-vs-t3-code.md)
- [Antigravity CLI vs T3 Code](https://www.anchorterminal.com/compare/antigravity-cli-vs-t3-code.md)
- [Auggie CLI vs T3 Code](https://www.anchorterminal.com/compare/auggie-vs-t3-code.md)
- [AXLR vs T3 Code](https://www.anchorterminal.com/compare/axlr-vs-t3-code.md)
- [Claude Code vs T3 Code](https://www.anchorterminal.com/compare/claude-code-vs-t3-code.md)
- [Cline vs T3 Code](https://www.anchorterminal.com/compare/cline-vs-t3-code.md)
- [Conductor vs T3 Code](https://www.anchorterminal.com/compare/conductor-vs-t3-code.md)
- [Crush vs T3 Code](https://www.anchorterminal.com/compare/crush-vs-t3-code.md)
- [Cursor CLI vs T3 Code](https://www.anchorterminal.com/compare/cursor-cli-vs-t3-code.md)
- [DeepSeek Harness (dsh) vs T3 Code](https://www.anchorterminal.com/compare/deepseek-harness-vs-t3-code.md)
- [dsh-superagent (DeepSeek) vs T3 Code](https://www.anchorterminal.com/compare/deepseek-superagent-vs-t3-code.md)
- [Devin vs T3 Code](https://www.anchorterminal.com/compare/devin-vs-t3-code.md)
- [Droid CLI vs T3 Code](https://www.anchorterminal.com/compare/droid-cli-vs-t3-code.md)
- [Pi vs T3 Code](https://www.anchorterminal.com/compare/earendil-pi-vs-t3-code.md)
- [Emdash vs T3 Code](https://www.anchorterminal.com/compare/emdash-vs-t3-code.md)
- [Gemini CLI vs T3 Code](https://www.anchorterminal.com/compare/gemini-cli-vs-t3-code.md)
- [GitHub Copilot CLI vs T3 Code](https://www.anchorterminal.com/compare/github-copilot-cli-vs-t3-code.md)
- [goose vs T3 Code](https://www.anchorterminal.com/compare/goose-vs-t3-code.md)
- [Harness² vs T3 Code](https://www.anchorterminal.com/compare/harness2-vs-t3-code.md)
- [HarnessRouter vs T3 Code](https://www.anchorterminal.com/compare/harnessrouter-vs-t3-code.md)
- [Jules vs T3 Code](https://www.anchorterminal.com/compare/jules-vs-t3-code.md)
- [Junie CLI vs T3 Code](https://www.anchorterminal.com/compare/junie-vs-t3-code.md)
- [Kilo Code CLI vs T3 Code](https://www.anchorterminal.com/compare/kilo-code-cli-vs-t3-code.md)
- [Kimi Code CLI vs T3 Code](https://www.anchorterminal.com/compare/kimi-code-cli-vs-t3-code.md)
- [Kiro CLI vs T3 Code](https://www.anchorterminal.com/compare/kiro-cli-vs-t3-code.md)
- [Letta vs T3 Code](https://www.anchorterminal.com/compare/letta-vs-t3-code.md)
- [mini-swe-agent vs T3 Code](https://www.anchorterminal.com/compare/mini-swe-agent-vs-t3-code.md)
- [MiniMax Code vs T3 Code](https://www.anchorterminal.com/compare/minimax-code-vs-t3-code.md)
- [Mistral Vibe CLI vs T3 Code](https://www.anchorterminal.com/compare/mistral-vibe-cli-vs-t3-code.md)
- [Muse Code vs T3 Code](https://www.anchorterminal.com/compare/muse-code-vs-t3-code.md)
- [OpenAI Agents API vs T3 Code](https://www.anchorterminal.com/compare/openai-agents-api-vs-t3-code.md)
- [OpenAI Codex vs T3 Code](https://www.anchorterminal.com/compare/openai-codex-vs-t3-code.md)
- [OpenCode vs T3 Code](https://www.anchorterminal.com/compare/opencode-vs-t3-code.md)
- [OpenHands vs T3 Code](https://www.anchorterminal.com/compare/openhands-vs-t3-code.md)
- [Orca vs T3 Code](https://www.anchorterminal.com/compare/orca-vs-t3-code.md)
- [Paseo vs T3 Code](https://www.anchorterminal.com/compare/paseo-vs-t3-code.md)
- [Prime Agent vs T3 Code](https://www.anchorterminal.com/compare/prime-agent-vs-t3-code.md)
- [Qoder CLI vs T3 Code](https://www.anchorterminal.com/compare/qoder-cli-vs-t3-code.md)
- [Qwen Code vs T3 Code](https://www.anchorterminal.com/compare/qwen-code-vs-t3-code.md)
- [Mirror CLI vs T3 Code](https://www.anchorterminal.com/compare/reflection-mirror-vs-t3-code.md)
- [Rovo Dev CLI vs T3 Code](https://www.anchorterminal.com/compare/rovo-dev-cli-vs-t3-code.md)
- [Sculptor vs T3 Code](https://www.anchorterminal.com/compare/sculptor-vs-t3-code.md)
- [T3 Code vs Traycer](https://www.anchorterminal.com/compare/t3-code-vs-traycer.md)
- [T3 Code vs Unstoppable](https://www.anchorterminal.com/compare/t3-code-vs-unstoppable.md)
- [T3 Code vs Verdent](https://www.anchorterminal.com/compare/t3-code-vs-verdent.md)
- [T3 Code vs Vibe-Trading](https://www.anchorterminal.com/compare/t3-code-vs-vibe-trading.md)
- [T3 Code vs Warp (Warp Agent CLI and the Oz Agent API)](https://www.anchorterminal.com/compare/t3-code-vs-warp.md)
- [Clawboo vs T3 Code](https://www.anchorterminal.com/compare/clawboo-vs-t3-code.md)
- [CLI Manager vs T3 Code](https://www.anchorterminal.com/compare/cli-manager-vs-t3-code.md)
- [Harness vs T3 Code](https://www.anchorterminal.com/compare/harness-autonomous-vs-t3-code.md)
- [OpenMausBot vs T3 Code](https://www.anchorterminal.com/compare/openmausbot-vs-t3-code.md)
- [Paperclip vs T3 Code](https://www.anchorterminal.com/compare/paperclip-vs-t3-code.md)
- [Parallax vs T3 Code](https://www.anchorterminal.com/compare/parallax-agents-vs-t3-code.md)

---

Query this catalogue directly over MCP: https://www.anchorterminal.com/mcp (Streamable HTTP, no key). How: https://www.anchorterminal.com/agents/#mcp