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Claude Opus 5.5
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Gemma 4 31B
Step 5 PreviewClaude Opus 5 vs MiMo-V2.6-Pro
- Claude Opus 5 rates higher on LMArena’s text leaderboard: 1508 against 1491.
- MiMo-V2.6-Pro is cheaper: $0.43 / $0.87 per million input / output tokens, against $5 / $25 for Claude Opus 5.
- MiMo-V2.6-Pro has the longer context window: 1.1M tokens against 1M.
- On the 6 Vals AI benchmarks both have taken, Claude Opus 5 wins 6 and MiMo-V2.6-Pro wins 0.
LatestMiMo-V2.6-Pro 1491
Side by side
Models (2/6)
- Claude Opus 5
- MiMo-V2.6-Pro
| Benchmark | Claude Opus 5 | MiMo-V2.6-Pro |
|---|---|---|
| The model | ||
| Lab | Anthropic | Xiaomi |
| Released | 2026-07-24 | 2026-09-21 |
| Weights | Proprietary | Open |
| Context window | 1M | 1.1M |
| Input, per 1M tokens | $5 | $0.43 |
| Output, per 1M tokens | $25 | $0.87 |
| LMArena, people’s votes | ||
| LMArena TextMillions of people compare two anonymous models side by side and vote for the better answer | 1508#4 of 351 | 1491#11 of 351 |
| LMArena WebDevPeople ask two anonymous models to build the same web app, try both and vote for the better one | 1691#9 of 124 | 1625#23 of 124 |
| LMArena VisionSide-by-side votes on prompts that include an image | 1320#3 of 146 | 1263#53 of 146 |
| LMArena CodingLMArena’s text votes on prompts that ask for code | 1533#4 of 346 | 1533#5 of 346 |
| LMArena MathLMArena’s text votes on math prompts | 1533#2 of 339 | 1500#16 of 339 |
| LMArena Creative writingLMArena’s text votes on stories, poems and other creative writing | 1495#5 of 349 | 1466#20 of 349 |
| LMArena Hard promptsLMArena’s text votes on the hardest prompts | 1527#4 of 351 | 1511#8 of 351 |
| LMArena Instruction followingLMArena’s text votes on prompts with specific instructions to follow | 1518#5 of 351 | 1491#12 of 351 |
| Vals AI, overall | ||
| Vals IndexVals AI’s headline score | — | 57.81%#14 of 27 |
| Vals AI, coding | ||
| Terminal-Bench 4.0Frontier-difficulty tasks an agent completes in a real terminal | 53.53%#9 of 55 | 31.31%#21 of 55 |
| SWE-benchReal GitHub issues from open-source projects | 97.00%#1 of 85 | — |
| Vibe Code BenchBuilding complete web apps from a plain-language brief, graded on whether the app works | 88.40%#9 of 115 | 85.22%#15 of 115 |
| Code MigrationRewriting working programs in a new language, graded on whether the new program still passes its tests | — | 48.79%#16 of 28 |
| LiveCodeBenchFresh competitive programming problems, collected after models’ training cut-offs to avoid contamination | 89.03%#4 of 143 | — |
| Vals AI, finance | ||
| Finance AgentThe core tasks of a financial analyst, done as an agent with research tools | — | 64.26%#10 of 31 |
| Finance IndexVals AI’s composite of finance tasks | — | 57.85%#12 of 31 |
| Tax Agent BenchAgentic research into US corporate tax questions | 45.55%#4 of 76 | 32.39%#19 of 76 |
| Vals AI, law | ||
| Legal IndexVals AI’s composite of legal tasks | — | 72.14%#8 of 28 |
| Legal Research BenchAgentic US legal research | 55.29%#2 of 85 | 47.12%#15 of 85 |
| Vals AI, medicine | ||
| MedCodeAssigning the right medical billing codes from clinical notes | 63.57%#1 of 107 | 44.97%#39 of 107 |
| Vals AI, reasoning | ||
| GPQA DiamondGraduate-level questions in biology, physics and chemistry that experts answer well and search does not | 93.43%#8 of 138 | — |
| MMLU-ProHarder, reasoning-focused multiple choice across 14 subjects, from law to engineering | 91.59%#2 of 138 | — |
| MMMUCollege-level questions that need both an image and text | 89.88%#2 of 93 | — |
| Terminal-Bench ScienceExpert-written scientific research workflows, run by an agent in a terminal | 27.14%#9 of 42 | 2.86%#33 of 42 |
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Questions
Which is better, Claude Opus 5 or MiMo-V2.6-Pro?
Claude Opus 5 rates higher on LMArena’s text leaderboard: 1508 against 1491. MiMo-V2.6-Pro is cheaper: $0.43 / $0.87 per million input / output tokens, against $5 / $25 for Claude Opus 5. MiMo-V2.6-Pro has the longer context window: 1.1M tokens against 1M. On the 6 Vals AI benchmarks both have taken, Claude Opus 5 wins 6 and MiMo-V2.6-Pro wins 0.
Which is cheaper, Claude Opus 5 or MiMo-V2.6-Pro?
MiMo-V2.6-Pro is cheaper: $0.43 / $0.87 per million input / output tokens, against $5 / $25 for Claude Opus 5.