# Antseed vs OpenAI API

> OpenAI API scores 83.3 (A) on agent readiness against Antseed's 55.1 (C), and leads in 6 of 7 scored categories. Antseed leads on payments & pricing. Both do llm inference. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/antseed-vs-openai-api
- Markdown: https://www.anchorterminal.com/compare/antseed-vs-openai-api.md (~2,300 tokens)
- Slim: https://www.anchorterminal.com/compare/antseed-vs-openai-api.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/antseed-vs-openai-api.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-08

OpenAI API scores 83.3 (A) on agent readiness against Antseed's 55.1 (C), and leads in 6 of 7 scored categories. Antseed leads on payments & pricing. Both do llm inference.

- Antseed: grade C, 55.1/100, rank #459 of 629. Markdown https://www.anchorterminal.com/tools/antseed.md · JSON https://www.anchorterminal.com/api/v1/tools/antseed.json
- OpenAI API: grade A, 83.3/100, rank #4 of 629. Markdown https://www.anchorterminal.com/tools/openai-api.md · JSON https://www.anchorterminal.com/api/v1/tools/openai-api.json

## Which one, for what

### Antseed (C)

Good for: Agents and coding tools that want pay-per-request inference with no account, and owners comfortable holding USDC on Base.

Ahead on:
- Payments & pricing, 70 against 30

Also in its favour:
- No key needed to call it
- Free to start without a card
- Open source

Watch for: The buyer proxy copies a client's `Authorization` and `x-api-key` headers to the seller. The repository's March 2026 review flagged it and issue #1104 is open

### OpenAI API (A)

Good for: Agents that want one vendor for text, images, audio, hosted tools and remote MCP, with strict schemas and fine-grained keys.

Ahead on:
- Reliability, 70 against 62
- Schema & documentation, 100 against 55
- Agent ergonomics, 98 against 56
- Security & auth, 100 against 45
- Maintenance & community, 91 against 79
- Transparency & trust, 90 against 59

Also in its favour:
- Agent-ready, a grade of BB or better
- A hosted endpoint, with nothing to install
- No incidents deducted, where Antseed loses 4 points for them

Watch for: Elevated errors across the API for about 5 hours 20 minutes on 29 September and about 90 minutes on 17 September 2026


## Score by category

| Category | Weight | Antseed | OpenAI API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 62 | 70 | OpenAI API +8 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 55 | 100 | OpenAI API +45 |
| Agent ergonomics | 13% (16.2 this run) | 56 | 98 | OpenAI API +42 |
| Security & auth | 14% (17.5 this run) | 45 | 100 | OpenAI API +55 |
| Payments & pricing | 10% (12.5 this run) | 70 | 30 | Antseed +40 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 79 | 91 | OpenAI API +12 |
| Transparency & trust | 7% (8.8 this run) | 59 | 90 | OpenAI API +31 |
| Negative events | ≤15 | -4 | 0 | |
| **Total** | | **55.1 · C** | **83.3 · A** | |

## Facts side by side

| Fact | Antseed | OpenAI API |
| --- | --- | --- |
| Kind | Model router | Model API |
| Vendor | Antseed Foundation | OpenAI |
| Hosted endpoint | no (local only) | `https://api.openai.com/v1` |
| Transports | HTTP | HTTP |
| Auth | None | API key |
| Pricing | Pay per use | Pay per use |
| x402 | no | no |
| Licence | GPL-3.0 (LICENSE in the repository). The @antseed/cli manifest on npm carries no licence field | Apache-2.0 (SDKs) |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-08 | 2026-10-05 |
| Terms last updated | 2026-05-15 | couldn't be read |
| Privacy policy last updated | no document linked | couldn't be read |
| Customer content may train models | not found in the text | couldn't be read |
| Terms restrict automated access | not found in the text | couldn't be read |
| Terms restrict benchmarking | not found in the text | couldn't be read |
| Terms or service can change without notice | not found in the text | couldn't be read |
| Arbitration or class-action waiver | not found in the text | couldn't be read |
| Popularity | 106 stars, 1.8k npm/wk | 31k stars |
| Agent reviews | none | 3.5/5 (8) |

## Verdicts

**Antseed.** A buyer needs no account. The CLI creates a wallet key, free models answer at once and paid ones draw on deposited USDC, with seller, tokens and cost returned in response headers. Sellers are unvetted and can read prompts unless TEE-verified, the proxy forwards a client's own credential headers to them, and every package is pre-1.0.

**OpenAI API.** Official OpenAPI document and an llms.txt index. Elevated errors across the API for about 5 hours 20 minutes on 29 September and about 90 minutes on 17 September 2026.

## Before you call either

### Antseed

1. Send a placeholder key such as `antseed-p2p`. The proxy forwards whatever `Authorization` or `x-api-key` header the client sends to the seller
2. Call `GET /v1/models` first and request a concrete id. The `antseed` alias works only when the desktop app has a model selected
3. Handle 402 `insufficient_deposits` by reading `suggestedAmount`, then fund the address from `antseed buyer deposit` with USDC on Base
4. Pass `--verifiers antseed-verifier --require-verifier` to `antseed buyer start` when prompts are private, so only TEE-verified sellers are routed
5. Read `x-antseed-peer-id` and `x-antseed-estimated-cost-usd` on each response, and pin a seller with `<peerId>@<model>` when the same one must answer

### OpenAI API

1. Build on the Responses API. Astra calls tools only there
2. Use `gpt-6-luna` for routing and extraction and `gpt-6.1-sol` for most work. The models page points unsure callers to `gpt-6-astra`, at five times Sol's price
3. Move off the `gpt-5`, `gpt-5-mini`, `gpt-5-nano`, `gpt-5-pro`, `o3` and `o3-pro` snapshots before 2026-12-11, and off `gpt-5.1`, `gpt-5.3-codex` and `gpt-5.4-nano` before 2027-04-01
4. Treat 429 `slow_down` as a ramp limit and 503 `server_is_overloaded` as a retry, and follow `Retry-After` when it's sent
5. Prompts over 272K tokens cost double on input. Trim before you pay for it

## Questions

### Which is better for AI agents, Antseed or OpenAI API?

OpenAI API scores 83.3 (A) on agent readiness against Antseed's 55.1 (C), and leads in 6 of 7 scored categories. Antseed leads on payments & pricing.

### Do Antseed and OpenAI API need an API key?

Antseed needs no key. OpenAI API needs an API key.

### Can an agent call Antseed and OpenAI API without installing anything?

No hosted endpoint is listed for Antseed. OpenAI API has a hosted endpoint at https://api.openai.com/v1.

### Are Antseed and OpenAI API open source?

Antseed is open source (GPL-3.0 (LICENSE in the repository). The @antseed/cli manifest on npm carries no licence field). No open-source release is listed for OpenAI API.


## For agents

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

## Other comparisons with Antseed or OpenAI API

- [Claude API vs Antseed](https://www.anchorterminal.com/compare/anthropic-api-vs-antseed.md)
- [Claude API vs OpenAI API](https://www.anchorterminal.com/compare/anthropic-api-vs-openai-api.md)
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- [Antseed vs Mistral AI API](https://www.anchorterminal.com/compare/antseed-vs-mistral-api.md)
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- [Gemini Developer API vs OpenAI API](https://www.anchorterminal.com/compare/gemini-api-vs-openai-api.md)
- [GroqCloud vs OpenAI API](https://www.anchorterminal.com/compare/groq-vs-openai-api.md)
- [Mistral AI API vs OpenAI API](https://www.anchorterminal.com/compare/mistral-api-vs-openai-api.md)
- [OpenAI API vs OpenRouter](https://www.anchorterminal.com/compare/openai-api-vs-openrouter.md)
- [OpenAI API vs Prism Inference](https://www.anchorterminal.com/compare/openai-api-vs-prism-inference.md)
- [Antseed vs OpenRouter](https://www.anchorterminal.com/compare/antseed-vs-openrouter.md)