Claude Mythos Preview vs Mistral Medium 3

Claude Mythos Preview (2026) and Mistral Medium 3 (2025) are frontier reasoning models from Anthropic and MistralAI. Claude Mythos Preview ships a 1M-token context window, while Mistral Medium 3 ships a 128K-token context window. On pricing, Mistral Medium 3 costs $0.40/1M input tokens versus $25/1M for the alternative. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.

Mistral Medium 3 is ~6150% cheaper at $0.40/1M; pay for Claude Mythos Preview only for coding workflow support.

Decision scorecard

Local evidence first
SignalClaude Mythos PreviewMistral Medium 3
Best forreasoning-heavy apps, multimodal apps, and tool-calling agentsmultimodal apps, tool-calling agents, and provider-routed production
Decision fitCoding, RAG, and AgentsCoding, RAG, and Agents
Context window1M128K
Cheapest output$125/1M tokens$2/1M tokens
Provider routes2 tracked5 tracked
Shared benchmarks0 shared0 shared

Decision tradeoffs

Choose Claude Mythos Preview when...
  • Claude Mythos Preview has the larger context window for long prompts, retrieval packs, or transcript analysis.
  • Claude Mythos Preview uniquely exposes Reasoning in local model data.
  • Local decision data tags Claude Mythos Preview for Coding, RAG, and Agents.
Choose Mistral Medium 3 when...
  • Mistral Medium 3 has the lower cheapest tracked output price at $2/1M tokens.
  • Mistral Medium 3 has broader tracked provider coverage for fallback and route flexibility.
  • Local decision data tags Mistral Medium 3 for Coding, RAG, and Agents.

Monthly cost at traffic

Estimate token spend from the cheapest tracked input and output route or tier on this page.

Lower estimate Mistral Medium 3

Claude Mythos Preview

$51,250

Cheapest tracked route/tier: Anthropic

Mistral Medium 3

$820

Cheapest tracked route/tier: Mistral AI Studio

Estimated monthly gap: $50,430. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

Claude Mythos Preview -> Mistral Medium 3
  • Provider overlap exists on Microsoft Foundry; start route-level A/B tests there.
  • Mistral Medium 3 is $123/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
  • Check replacement coverage for Reasoning before moving production traffic.
Mistral Medium 3 -> Claude Mythos Preview
  • Provider overlap exists on Microsoft Foundry; start route-level A/B tests there.
  • Claude Mythos Preview is $123/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
  • Claude Mythos Preview adds Reasoning in local capability data.

Specs

Specification
Released2026-05-012025-05-01
Context window1M128K
Parameters——
ArchitectureDecoder OnlyDecoder Only
LicenseProprietaryProprietary
OpennessProprietaryProprietary
WeightsNot releasedNot released
CodeUnknownUnknown
Commercial useRestrictedRestricted
Knowledge cutoff2025-122025-03

Pricing and availability

Pricing attributeClaude Mythos PreviewMistral Medium 3
Input price$25/1M tokens$0.40/1M tokens
Output price$125/1M tokens$2/1M tokens
Providers
AnthropicMicrosoft Foundry
NVIDIA NIMMistral AI StudioMicrosoft FoundryOpenRouterGCP Vertex AI

Capabilities

CapabilityClaude Mythos PreviewMistral Medium 3
VisionYesYes
MultimodalYesYes
ReasoningYesNo
JSON / Tool useYesYes
Structured outputsYesYes
Code executionYesYes
IDE integrationNoNo
Computer useNoNo
Parallel agentsNoNo

Benchmarks

No shared benchmark scores are currently available for this pair.

Deep dive

The capability footprint differs most on reasoning mode: Claude Mythos Preview. Both models share vision, multimodal input, JSON / Tool use, and JSON / 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.

For cost, Claude Mythos Preview lists $25/1M input and $125/1M output tokens on the cheapest tracked provider, while Mistral Medium 3 lists $0.40/1M input and $2/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Mistral Medium 3 lower by about $54.12 per million blended tokens. Availability is 2 providers versus 5, so concentration risk also matters.

Choose Claude Mythos Preview when coding workflow support and larger context windows are central to the workload. Choose Mistral Medium 3 when coding workflow support, lower input-token cost, 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. This keeps the decision grounded in measurable tradeoffs instead of brand-level assumptions. It also helps separate model capability from provider packaging, which can change cost and latency.

FAQ

Which has a larger context window, Claude Mythos Preview or Mistral Medium 3?

Claude Mythos Preview supports 1M tokens, while Mistral Medium 3 supports 128K tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.

Which is cheaper, Claude Mythos Preview or Mistral Medium 3?

Mistral Medium 3 is cheaper on tracked token pricing. Claude Mythos Preview costs $25/1M input and $125/1M output tokens. Mistral Medium 3 costs $0.40/1M input and $2/1M output tokens. Provider discounts or batch pricing can still change the final bill.

Is Claude Mythos Preview or Mistral Medium 3 open source?

Claude Mythos Preview is listed under Proprietary. Mistral Medium 3 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 Mistral Medium 3?

Both Claude Mythos Preview and Mistral Medium 3 expose vision. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.

Which is better for multimodal input, Claude Mythos Preview or Mistral Medium 3?

Both Claude Mythos Preview and Mistral Medium 3 expose multimodal input. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.

Where can I run Claude Mythos Preview and Mistral Medium 3?

Claude Mythos Preview is available on Anthropic and Microsoft Foundry. Mistral Medium 3 is available on NVIDIA NIM, Mistral AI Studio, Microsoft Foundry, OpenRouter, and GCP Vertex AI. Provider coverage can affect latency, region availability, compliance posture, and fallback options.

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Last reviewed: 2026-10-18. Data sourced from public model cards and provider documentation.