Claude Mythos Preview vs GPT-4.1
Claude Mythos Preview (2026) and GPT-4.1 (2025) are frontier reasoning models from Anthropic and OpenAI. Claude Mythos Preview ships a 1M-token context window, while GPT-4.1 ships a 1M-token context window. On SWE-bench Verified, Claude Mythos Preview leads by 39.3 pts. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit. It focuses on practical selection signals rather than broad model-family marketing.
Claude Mythos Preview is safer overall; choose GPT-4.1 when coding workflow support matters.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-04-07 | 2025-04-01 |
| Context window | 1M | 1M |
| Parameters | — | — |
| Architecture | decoder only | decoder only |
| License | Proprietary | Proprietary |
| Knowledge cutoff | 2025-12 | 2025-01 |
Pricing and availability
| Pricing attribute | Claude Mythos Preview | GPT-4.1 |
|---|---|---|
| Input price | - | $2/1M tokens |
| Output price | - | $8/1M tokens |
| Providers | - |
Capabilities
| Capability | Claude Mythos Preview | GPT-4.1 |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | No |
| Function calling | Yes | Yes |
| Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | Yes | Yes |
Benchmarks
| Benchmark | Claude Mythos Preview | GPT-4.1 |
|---|---|---|
| SWE-bench Verified | 93.9 | 54.6 |
Deep dive
On shared benchmark coverage, SWE-bench Verified has Claude Mythos Preview at 93.9 and GPT-4.1 at 54.6, with Claude Mythos Preview ahead by 39.3 points. The largest visible gap is 39.3 points on SWE-bench Verified, which matters most when that benchmark mirrors your workload. Treat isolated benchmark wins as directional, because provider routing, prompt style, and tool access can move real application results.
The capability footprint differs most on reasoning mode: Claude Mythos Preview. Both models share vision, multimodal input, function calling, and tool use, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
Pricing coverage is uneven: Claude Mythos Preview has no token price sourced yet and GPT-4.1 has $2/1M input tokens. Provider availability is 0 tracked routes versus 3. Treat unknown pricing as an integration gap, then verify the route you will actually call before estimating production spend.
Choose Claude Mythos Preview when coding workflow support are central to the workload. Choose GPT-4.1 when coding workflow support, larger context windows, and broader provider choice are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship.
FAQ
Which has a larger context window, Claude Mythos Preview or GPT-4.1?
GPT-4.1 supports 1M tokens, while Claude Mythos Preview supports 1M tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Is Claude Mythos Preview or GPT-4.1 open source?
Claude Mythos Preview is listed under Proprietary. GPT-4.1 is listed under Proprietary. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for vision, Claude Mythos Preview or GPT-4.1?
Both Claude Mythos Preview and GPT-4.1 expose vision. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Which is better for multimodal input, Claude Mythos Preview or GPT-4.1?
Both Claude Mythos Preview and GPT-4.1 expose multimodal input. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Which is better for reasoning mode, Claude Mythos Preview or GPT-4.1?
Claude Mythos Preview has the clearer documented reasoning mode signal in this comparison. If reasoning mode is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run Claude Mythos Preview and GPT-4.1?
Claude Mythos Preview is available on the tracked providers still being sourced. GPT-4.1 is available on OpenRouter, Azure OpenAI, and OpenAI API. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-05-11. Data sourced from public model cards and provider documentation.