LLM Reference

Claude Sonnet 4.5 vs Mistral Large 2

Claude Sonnet 4.5 (2025) and Mistral Large 2 (2025) are frontier reasoning models from Anthropic and MistralAI. Claude Sonnet 4.5 ships a 200k-token context window, while Mistral Large 2 ships a 128k-token context window. On MMLU PRO, Claude Sonnet 4.5 leads by 16.3 pts. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.

Mistral Large 2 is safer overall; choose Claude Sonnet 4.5 when reasoning depth matters.

Decision scorecard

Local evidence first
SignalClaude Sonnet 4.5Mistral Large 2
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 window200k128k
Cheapest output$15/1M tokens$2.40/1M tokens
Provider routes8 tracked3 tracked
Shared benchmarksMMLU PRO leader2 shared

Decision tradeoffs

Choose Claude Sonnet 4.5 when...
  • Claude Sonnet 4.5 holds a shared-benchmark lead on MMLU PRO, ahead by 16.3 points.
  • Claude Sonnet 4.5 has the larger context window for long prompts, retrieval packs, or transcript analysis.
  • Claude Sonnet 4.5 has broader tracked provider coverage for fallback and route flexibility.
  • Claude Sonnet 4.5 uniquely exposes Reasoning in local model data.
  • Local decision data tags Claude Sonnet 4.5 for Coding, RAG, and Agents.
Choose Mistral Large 2 when...
  • Mistral Large 2 has the lower cheapest tracked output price at $2.40/1M tokens.
  • Local decision data tags Mistral Large 2 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 Large 2

Claude Sonnet 4.5

$6,150

Cheapest tracked route/tier: Microsoft Foundry

Mistral Large 2

$984

Cheapest tracked route/tier: AWS Bedrock

Estimated monthly gap: $5,166. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

Claude Sonnet 4.5 -> Mistral Large 2
  • Provider overlap exists on AWS Bedrock; start route-level A/B tests there.
  • Mistral Large 2 is $12.60/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
  • Check replacement coverage for Reasoning before moving production traffic.
Mistral Large 2 -> Claude Sonnet 4.5
  • Provider overlap exists on AWS Bedrock; start route-level A/B tests there.
  • Claude Sonnet 4.5 is $12.60/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
  • Claude Sonnet 4.5 adds Reasoning in local capability data.

Specs

Specification
Released2025-09-292025-11-25
Context window200k128k
Parameters—123B
ArchitectureDecoder OnlyDecoder Only
LicenseProprietaryMistral License
OpennessProprietaryOpen weights
WeightsNot releasedUnknown
CodeUnknownUnknown
Commercial useCommercial use: conditionalCommercial use: non-commercial
Knowledge cutoff2025-122025-07

Pricing and availability

Pricing attributeClaude Sonnet 4.5Mistral Large 2
Input price
0-200,001t
$3/1M tokens
200,001t+
$6/1M tokens
$0.48/1M tokens
Output price
0-200,001t
$15/1M tokens
200,001t+
$22.50/1M tokens
$2.40/1M tokens
Providers
Microsoft FoundryAnthropicSnowflake CortexGCP Vertex AIAWS BedrockReplicate API
IBM watsonxAWS BedrockMistral AI Studio

Capabilities

CapabilityClaude Sonnet 4.5Mistral Large 2
VisionYesYes
MultimodalYesYes
ReasoningYesNo
JSON / Tool useYesYes
Structured outputsYesYes
Code executionNoNo
IDE integrationNoNo
Computer useNoNo
Parallel agentsNoNo

Benchmarks

BenchmarkClaude Sonnet 4.5Mistral Large 2
MMLU PRO86.069.7
BFCL73.238.4

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Last reviewed: 2026-07-26. Data sourced from public model cards and provider documentation.