LLM Reference

Codex 1 vs Mistral Large 3 675B Instruct

Codex 1 (2025) and Mistral Large 3 675B Instruct (2025) compare a coding-specialized model against a standalone API model. Codex 1 ships a 192k-token context window, while Mistral Large 3 675B Instruct ships a 128k-token context window. This page treats the result as workflow and deployment fit, not a universal model winner.

Treat this as a product-type comparison: Codex 1 is coding-specialized model, while Mistral Large 3 675B Instruct is standalone API model. Choose based on workflow fit before reading any benchmark or price row as decisive.

Decision scorecard

Local evidence first
SignalCodex 1Mistral Large 3 675B Instruct
Product typeCoding-specialized modelStandalone API model
Best forcustom coding agents and code generationmultimodal apps and provider-routed production
Decision fitCoding, Agents, and Long contextCoding, RAG, and Agents
Context window192k128k
Cheapest output-$1.50/1M tokens
Provider routes0 tracked6 tracked
Shared benchmarks0 shared0 shared

Decision tradeoffs

Choose Codex 1 when...
  • Codex 1 has the larger context window for long prompts, retrieval packs, or transcript analysis.
  • Codex 1 uniquely exposes Reasoning and Code execution in local model data.
  • Local decision data tags Codex 1 for Coding, Agents, and Long context.
Choose Mistral Large 3 675B Instruct when...
  • Mistral Large 3 675B Instruct has broader tracked provider coverage for fallback and route flexibility.
  • Mistral Large 3 675B Instruct uniquely exposes Vision, Multimodal, and Structured outputs in local model data.
  • Local decision data tags Mistral Large 3 675B Instruct 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.

Codex 1

Unavailable

No complete token price in local provider data

Mistral Large 3 675B Instruct

$775

Cheapest tracked route/tier: OpenRouter

Cost delta unavailable until both models have sourced input and output token prices.

Switch friction

Codex 1 -> Mistral Large 3 675B Instruct
  • No overlapping tracked provider route is sourced for Codex 1 and Mistral Large 3 675B Instruct; plan for SDK, billing, or endpoint changes.
  • Check replacement coverage for Reasoning and Code execution before moving production traffic.
  • Mistral Large 3 675B Instruct adds Vision, Multimodal, and Structured outputs in local capability data.
Mistral Large 3 675B Instruct -> Codex 1
  • No overlapping tracked provider route is sourced for Mistral Large 3 675B Instruct and Codex 1; plan for SDK, billing, or endpoint changes.
  • Check replacement coverage for Vision, Multimodal, and Structured outputs before moving production traffic.
  • Codex 1 adds Reasoning and Code execution in local capability data.

Specs

Specification
Released2025-05-162025-12-01
Context window192k128k
Parameters—675B
ArchitectureDecoder OnlyDecoder Only
LicenseProprietaryApache 2.0OSI-approved
OpennessProprietaryOpen source
WeightsNot releasedUnknown
CodeUnknownUnknown
Commercial useCommercial use: conditionalCommercial use: permitted
Knowledge cutoff-2024-11

Pricing and availability

Pricing attributeCodex 1Mistral Large 3 675B Instruct
Input price-$0.50/1M tokens
Output price-$1.50/1M tokens
Providers-
OpenRouterAWS BedrockNVIDIA NIMMistral AI StudioMicrosoft FoundryVercel AI Gateway

Capabilities

CapabilityCodex 1Mistral Large 3 675B Instruct
VisionNoYes
MultimodalNoYes
ReasoningYesNo
JSON / Tool useNoNo
Structured outputsNoYes
Code executionYesNo
IDE integrationNoNo
Computer useNoNo
Parallel agentsNoNo

Benchmarks

No shared benchmark scores are currently available for this pair.

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Last reviewed: 2026-06-29. Data sourced from public model cards and provider documentation.