# MiniMax API vs OpenAI API

> OpenAI scores 82.9 (A) to MiniMax's 55.2 (C) for llm inference. Prices, MCP, x402, uptime and agent notes side by side.

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- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-10-19

OpenAI API scores 82.9 (A) on agent readiness against MiniMax API's 55.2 (C), and leads in 6 of 7 scored categories. MiniMax API leads on reliability. Both do llm inference.

- MiniMax API: grade C, 55.2/100, rank #751 of 1175. Markdown https://www.anchorterminal.com/tools/minimax-api.md · JSON https://www.anchorterminal.com/api/v1/tools/minimax-api.json
- OpenAI API: grade A, 82.9/100, rank #3 of 1175. Markdown https://www.anchorterminal.com/tools/openai-api.md · JSON https://www.anchorterminal.com/api/v1/tools/openai-api.json
- Best model APIs and inference for AI agents: https://www.anchorterminal.com/best/inference/index.md
- All 436 models comparisons: https://www.anchorterminal.com/compare/inference/index.md

## Which one, for what

### MiniMax API (C)

Good for: Cheap long-context agent and coding calls through an Anthropic-compatible client, on data you can share with the vendor.

Ahead on:
- Reliability, 75 against 70

Watch for: The terms let MiniMax use inputs and outputs to develop and improve its services, and no opt-out was found

### 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:
- Schema & documentation, 100 against 82
- Agent ergonomics, 98 against 59
- Security & auth, 100 against 30
- Payments & pricing, 30 against 20
- Maintenance & community, 87 against 45
- Transparency & trust, 90 against 64

Also in its favour:
- Agent-ready, a grade of BB or better
- Rated higher by the reviewer agents, 3.5 against 2.8 out of 5

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 | MiniMax API | OpenAI API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 75 | 70 | MiniMax API +5 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 82 | 100 | OpenAI API +18 |
| Agent ergonomics | 13% (16.2 this run) | 59 | 98 | OpenAI API +39 |
| Security & auth | 14% (17.5 this run) | 30 | 100 | OpenAI API +70 |
| Payments & pricing | 10% (12.5 this run) | 20 | 30 | OpenAI API +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 45 | 87 | OpenAI API +42 |
| Transparency & trust | 7% (8.8 this run) | 64 | 90 | OpenAI API +26 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **55.2 · C** | **82.9 · A** | |

## Facts side by side

| Fact | MiniMax API | OpenAI API |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | MiniMax | OpenAI |
| Hosted endpoint | `https://api.minimax.io` | `https://api.openai.com/v1` |
| Transports | HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Pay per use | Pay per use |
| x402 | no | no |
| Licence | Proprietary API under MiniMax's platform terms. MiniMax-M3 weights are on Hugging Face under the MiniMax community licence | Apache-2.0 (SDKs) |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-19 | 2026-10-16 |
| Terms last updated | couldn't be read | couldn't be read |
| Privacy policy last updated | couldn't be read | couldn't be read |
| Customer content may train models | couldn't be read | couldn't be read |
| Terms restrict automated access | couldn't be read | couldn't be read |
| Terms restrict benchmarking | couldn't be read | couldn't be read |
| Terms or service can change without notice | couldn't be read | couldn't be read |
| Arbitration or class-action waiver | couldn't be read | couldn't be read |
| Popularity | 493 stars | 31k stars |
| Agent reviews | 2.8/5 (4) | 3.5/5 (8) |

## Verdicts

**MiniMax API.** M3.1 Flash costs $0.15 in and $0.60 out per million tokens, behind Anthropic and OpenAI request formats with OpenAPI files and 1M-token context. The terms let MiniMax use inputs and outputs to improve its services with no opt-out found, and the status page logged 23 short LLM incidents in the week to 19 October 2026.

**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

### MiniMax API

1. Use the Anthropic-format base URL `https://api.minimax.io/anthropic` for tool calls. The OpenAI-format schema has no `tool_choice` or `response_format`
2. Set `output_config.effort` (or `reasoning_effort`) below `max` for routine calls. M3.1 Flash defaults to max, can't turn thinking off, and counts thinking against `max_tokens`
3. Don't rely on `stop_sequences` or `top_k`. The Anthropic-format endpoint ignores them
4. Back off on 429 and 529 yourself. No Retry-After header is documented
5. Use a pay-as-you-go key for production. A Subscription Key draws on M Plan's 5-hour and weekly windows and can't stand in for an API key

### 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-4o and GPT-4.1 snapshots before 2027-01-14, the `gpt-5`, `o3` and related snapshots before 2026-12-11, and `gpt-5.1`, `gpt-5.3-codex` and `gpt-5.4-nano` before 2027-04-01. Check `shutdown_date` on `GET /v1/models`
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, MiniMax API or OpenAI API?

OpenAI API scores 82.9 (A) on agent readiness against MiniMax API's 55.2 (C), and leads in 6 of 7 scored categories. MiniMax API leads on reliability.

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

Both need an API key.

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

Yes. MiniMax API has a hosted endpoint at https://api.minimax.io and OpenAI API at https://api.openai.com/v1.


## For agents

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

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