Claude Opus 5 vs Mistral Medium 3.5 128B
At a Glance
| Compare | Claude Opus 5Anthropic |  Mistral Medium 3.5 128BMistral AI |
|---|---|---|
| Intelligence, Cost, and Efficiency | ||
| IntelligenceHigher is better · MM Intelligence v2.5 | #3 of 4694.1 score · 3/3 sources · complete | UnrankedNot in the 46-model eligible cohort |
| CostLower is better · Published-token output estimate | #39 of 44$0.371 per LiveBench case | UnrankedNot in the 44-model eligible cohort |
| EfficiencyHigher is better · MM Efficiency v1.5 | #13 of 3857.6 score · 3/3 sources · complete | UnrankedNot in the 38-model eligible cohort |
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $5.00Anthropic ↗ · Sep 3, 2026 | Not reported |
| Output priceFrom · USD / 1M tokens | $25.00Anthropic ↗ · Sep 3, 2026 | Not reported |
| Context windowMaximum documented tokens | 1,000K | 262K |
| Model facts checked | Aug 28, 2026View model evidence → | Aug 28, 2026View model evidence → |
Token prices are the lowest available sourced USD rates; input and output may use different providers. Cost ranking estimates output spend on LiveBench, not a full request bill. Ranking methodology →
Available Benchmarks
| Benchmark | Claude Opus 5 | Mistral-Medium-3.5-128B |
|---|---|---|
| LMArena Agent Arenaagent-2026-09-15-d25aabda0010 · outcome_score · leader | 10.16100% of row best · score · Claude Opus 5 (Max); 95% CI [8.61078356, 11.71492901]; sessions 19934; observations 2534849; rank 4 | -10.8881% of row best · score · Mistral Medium 3.5; 95% CI [-12.33636331, -9.41760729]; sessions 10244; observations 358935; rank 43 |
| LMArena Text Arenatext-2026-09-13-d25aabda0010 · arena_rating · leader | 1,504.92100% of row best · rating · claude-opus-5-high; 95% CI [1500.70174969, 1509.13092375]; votes 42617; rank 3 | 1,420.5894% of row best · rating · mistral-medium-3.5; 95% CI [1414.04225396, 1427.11615611]; votes 10996; rank 104 |
| LMArena Vision Arenavision-2026-09-13-d25aabda0010 · arena_rating · leader | 1,321.21100% of row best · rating · claude-opus-5-high; 95% CI [1313.68410123, 1328.73941303]; votes 11599; rank 3 | 1,222.0592% of row best · rating · mistral-medium-3.5; 95% CI [1212.30064904, 1231.79518832]; votes 5090; rank 71 |
| Overall ResultCounted from the protocol-matched rows above | 3 benchmark winsNo overall winner | 0 benchmark winsNo overall winner |
Third-party benchmark Only like-for-like primary-publisher results are shown; raw scores, relative scores, configuration, and token spend remain visible.
Side-by-Side Facts
| Field | Claude Opus 5 | Mistral-Medium-3.5-128B |
|---|---|---|
| Developer | Anthropic | Mistral AI |
| Family | Claude 5 | Mistral Medium 3 5 128b |
| Model | Claude Opus 5 | Mistral-Medium-3.5-128B |
| Version | Claude Opus 5 | Mistral-Medium-3.5-128B |
| Lifecycle | active | active |
| Released | 2026-07-24 | Unknown |
| Knowledge cutoff | Unknown | Unknown |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 1,000K | 262K |
| Total parameters | Unknown | 127.7B |
| Active parameters | Unknown | Unknown |
| License | Unknown | other |
| Open weights | No | Yes |
| API available | Yes | Unknown |
| Self-hostable | No | Yes |
| Provider access | Anthropic (Standard), Deepinfra (Standard), Openrouter (Standard) | Unknown |
| Capabilities | chat, generation, reasoning, tools | chat, generation, reasoning, tools |
Claude Opus 5 Capabilities
Mistral Medium 3.5 128B Capabilities
Related Comparisons
All image comparisons →| A | Pair | B | Context |
|---|---|---|---|
Claude Opus 4.8Anthropic | vs | Claude Opus 5Anthropic | family variantsimage, text |
Claude Opus 5Anthropic | vs |  GPT-6 AstraOpenAI | cross-developer peersimage, text |
Claude Fable 5.1Anthropic | vs | Claude Opus 5Anthropic | family variantsimage, text |
Claude Opus 5Anthropic | vs |  Gemini 3.1 ProGoogle DeepMind | cross-developer peerstext |
Claude Opus 5Anthropic | vs |  DeepSeek-V4.1-FlashDeepSeek | cross-developer peersimage, text |
Claude Opus 5Anthropic | vs | Grok 4.6xAI | cross-developer peersimage, text |
Claude Opus 5Anthropic | vs |  Qwen3.8-MaxQwen | cross-developer peersimage, text |
Claude Opus 5Anthropic | vs |  Kimi-K3Moonshot AI | cross-developer peersimage, text |
 MiniMax-M3MiniMax | vs | Claude Opus 5Anthropic | cross-developer peersimage, text |
Claude Opus 5Anthropic | vs |  GLM-5.3Z.ai | cross-developer peerstext |
Claude Opus 5Anthropic | vs |  Hy4 previewTencent | cross-developer peerstext |
Claude Opus 5Anthropic | vs | Seed 2.1 ProByteDance Seed | cross-developer peersimage, text |
Primary Evidence
Sources and Freshness
Questions
Claude Opus 5 vs Mistral Medium 3.5 128B FAQs
Is Claude Opus 5 or Mistral Medium 3.5 128B better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Opus 5 and Mistral Medium 3.5 128B, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Claude Opus 5 or Mistral Medium 3.5 128B?+
Only Claude Opus 5 has a directly sourced input price: $5.00 per million tokens. Only Claude Opus 5 has a directly sourced output price: $25.00 per million tokens.
Which has a larger context window, Claude Opus 5 or Mistral Medium 3.5 128B?+
Claude Opus 5 has the larger sourced context window. Claude Opus 5 supports 1,000K and Mistral Medium 3.5 128B supports 262K.
Which performs better in benchmarks, Claude Opus 5 or Mistral Medium 3.5 128B?+
There is no overall benchmark winner: An overall winner requires at least two decisive benchmarks from at least two original publishers.
Can Claude Opus 5 or Mistral Medium 3.5 128B be self-hosted?+
Mistral Medium 3.5 128B is the only model in this pair currently marked as self-hostable. Claude Opus 5 is not marked open weight; Mistral Medium 3.5 128B is open weight.
Can Claude Opus 5 and Mistral Medium 3.5 128B understand images?+
Claude Opus 5 is documented with image input; Mistral Medium 3.5 128B is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Claude Opus 5 or Mistral Medium 3.5 128B?+
Neither has a larger sourced maximum output. Claude Opus 5 is 128K and Mistral Medium 3.5 128B is —.
Do Claude Opus 5 and Mistral Medium 3.5 128B support reasoning and tool use?+
Claude Opus 5: reasoning, tool calling, and image input. Mistral Medium 3.5 128B: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, Claude Opus 5 or Mistral Medium 3.5 128B?+
Claude Opus 5 has 3 sourced provider routes; Mistral Medium 3.5 128B has 0, so Claude Opus 5 has broader tracked availability.
Which offers better value, Claude Opus 5 or Mistral Medium 3.5 128B?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.