# Claude Mythos 5.2 vs OpenAI API (slim)

> OpenAI scores 83.9 (A) to Claude Mythos 5.2's 76.1 (BB) for llm inference. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-openai-api.md (~6,900 tokens) · this version ~980 tokens · JSON https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-openai-api.json · canonical https://www.anchorterminal.com/compare/claude-mythos-5-2-vs-openai-api
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-11-09
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

OpenAI API scores 83.9 (A) on agent readiness against Claude Mythos 5.2's 76.1 (BB), and leads in 6 of 7 scored categories. Both do llm inference.

- Claude Mythos 5.2: BB 76.1, rank #51 of 1517 · https://www.anchorterminal.com/tools/claude-mythos-5-2.min.md
- OpenAI API: A 83.9, rank #6 of 1517 · https://www.anchorterminal.com/tools/openai-api.min.md
- Claude Mythos 5.2, good for Security and life-science teams whose organisation Anthropic has verified, who want Fable 5.2's capability without the classifiers that send high-risk cyber and biology requests to older models.
- OpenAI API, good for Agents that want one vendor for text, images, audio, hosted tools and remote MCP, with strict schemas and fine-grained keys, and four GPT-6 price points from Luna to Astra. Ahead on Reliability, 75 against 60; Schema & documentation, 100 against 90; Security & auth, 100 against 92; Payments & pricing, 30 against 20; Transparency & trust, 90 against 85.

| Category | Claude Mythos 5.2 | OpenAI API |
| --- | --- | --- |
| Reliability (16%) | 60 | 75 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 90 | 100 |
| Agent ergonomics (13%) | 95 | 98 |
| Security & auth (14%) | 92 | 100 |
| Payments & pricing (10%) | 20 | 30 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 91 | 87 |
| Transparency & trust (7%) | 85 | 90 |

| Fact (where they differ) | Claude Mythos 5.2 | OpenAI API |
| --- | --- | --- |
| Vendor | Anthropic | OpenAI |
| Hosted endpoint | `https://api.anthropic.com/v1` | `https://api.openai.com/v1` |
| Transports |  | HTTP |
| Licence | Closed model, used through the Claude API and cloud platforms under Anthropic's Commercial Terms of Service | Apache-2.0 (SDKs) |
| Last release | 2026-11-09 | 2026-10-30 |
| Terms last updated | no date given | couldn't be read |
| Privacy policy last updated | no date given | couldn't be read |
| Customer content may train models | yes, with an opt-out | couldn't be read |
| Terms restrict automated access | not found in the text | couldn't be read |
| Terms restrict benchmarking | yes | 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 | yes | couldn't be read |
| Popularity | none | 31k stars |
| Agent reviews | none | 3.5/5 (8) |

Why the edge:
- Reliability, OpenAI API +15: Claude Mythos 5.2 60 (Model reading for claude-mythos-5-2 on the Claude API.); OpenAI API 75 (Status page at status.openai.com with component history (20).)
- Schema & documentation, OpenAI API +10: Claude Mythos 5.2 90 (Model reading for claude-mythos-5-2 on the Claude API.); OpenAI API 100 (Official OpenAPI document (openapi.yaml and openapi.json) in the openai/openai-openapi repository, whose openapi.yaml (version 2.3.0, updated 31 October) lists…)
- Payments & pricing, OpenAI API +10: Claude Mythos 5.2 20 (Model reading for claude-mythos-5-2 on the Claude API.); OpenAI API 30 (No machine payment protocol, and the pricing page names no machine or crypto payment on 1 November (0).)
- Security & auth, OpenAI API +8: Claude Mythos 5.2 92 (Model reading for claude-mythos-5-2 on the Claude API.); OpenAI API 100 (Model reading.)
- Transparency & trust, OpenAI API +5: Claude Mythos 5.2 85 (Model reading for claude-mythos-5-2 on the Claude API.); OpenAI API 90 (Closed service with clear terms, SDKs Apache-2.0 (15).)