Claude Sonnet 4.6 vs Mistral Large 3 675B Instruct
Claude Sonnet 4.6 (2026) and Mistral Large 3 675B Instruct (2025) are frontier reasoning models from Anthropic and MistralAI. Claude Sonnet 4.6 ships a 1m-token context window, while Mistral Large 3 675B Instruct ships a 128k-token context window. On MMLU PRO, Claude Sonnet 4.6 leads by 1.8 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 3 675B Instruct is ~500% cheaper at $0.50/1M; pay for Claude Sonnet 4.6 only for coding workflow support.
Decision scorecard
Local evidence first| Signal | Claude Sonnet 4.6 | Mistral Large 3 675B Instruct |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | multimodal apps and provider-routed production |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 1m | 128k |
| Cheapest output | $15/1M tokens | $1.50/1M tokens |
| Provider routes | 6 tracked | 6 tracked |
| Shared benchmarks | MMLU PRO leader | 5 shared |
Decision tradeoffs
- Claude Sonnet 4.6 holds a shared-benchmark lead on MMLU PRO, ahead by 1.8 points.
- Claude Sonnet 4.6 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Claude Sonnet 4.6 uniquely exposes Reasoning, JSON / Tool use, and Code execution in local model data.
- Local decision data tags Claude Sonnet 4.6 for Coding, RAG, and Agents.
- Mistral Large 3 675B Instruct holds a shared-benchmark lead on LiveCodeBench, ahead by 2.8 points.
- Mistral Large 3 675B Instruct has the lower cheapest tracked output price at $1.50/1M tokens.
- 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.
Claude Sonnet 4.6
$6,150
Cheapest tracked route/tier: OpenRouter
Mistral Large 3 675B Instruct
$775
Cheapest tracked route/tier: OpenRouter
Estimated monthly gap: $5,375. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on OpenRouter, AWS Bedrock, and Microsoft Foundry; start route-level A/B tests there.
- Mistral Large 3 675B Instruct is $13.50/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Reasoning, JSON / Tool use, and Code execution before moving production traffic.
- Provider overlap exists on OpenRouter, AWS Bedrock, and Microsoft Foundry; start route-level A/B tests there.
- Claude Sonnet 4.6 is $13.50/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Claude Sonnet 4.6 adds Reasoning, JSON / Tool use, and Code execution in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-02-17 | 2025-12-01 |
| Context window | 1m | 128k |
| Parameters | — | 675B |
| Architecture | Decoder Only | Decoder Only |
| License | Proprietary | Apache 2.0OSI-approved |
| Openness | Proprietary | Open source |
| Weights | Not released | Unknown |
| Code | Unknown | Unknown |
| Commercial use | Commercial use: conditional | Commercial use: permitted |
| Knowledge cutoff | 2025-08 | 2024-11 |
Pricing and availability
| Pricing attribute | Claude Sonnet 4.6 | Mistral Large 3 675B Instruct |
|---|---|---|
| Input price | $3/1M tokens | $0.50/1M tokens |
| Output price | $15/1M tokens | $1.50/1M tokens |
| Providers |
Capabilities
| Capability | Claude Sonnet 4.6 | Mistral Large 3 675B Instruct |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | No |
| JSON / Tool use | Yes | No |
| Structured outputs | Yes | Yes |
| Code execution | Yes | No |
| IDE integration | No | No |
| Computer use | Yes | No |
| Parallel agents | Yes | No |
Benchmarks
| Benchmark | Claude Sonnet 4.6 | Mistral Large 3 675B Instruct |
|---|---|---|
| MMLU PRO | 87.3 | 85.5 |
| Google-Proof Q&A | 89.9 | 43.9 |
| LiveCodeBench | 80.0 | 82.8 |
| HumanEval | 98.0 | 92.0 |
| τ-bench | 87.5 | 70.2 |
Continue comparing
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- Claude Sonnet 4.6 vs Kimi K2.6
- Claude Sonnet 4.6 vs Composer 2.5
- Claude Sonnet 4.6 vs GPT-5.5 Pro
- Claude Sonnet 4.6 vs Gemini 3.5 Flash
- Claude Sonnet 4.6 vs GLM-5.1
Popular comparisons for Claude Sonnet 4.6
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Last reviewed: 2026-07-26. Data sourced from public model cards and provider documentation.