Claude Opus 5.5 vs MiMo-V2.6-Pro
Claude Opus 5.5 scores higher on the Models at Work leaderboard (85 vs 81 out of 100). MiMo-V2.6-Pro is about 15× cheaper per blended million tokens ($0.54 vs $8). On Artificial Analysis' independent Intelligence Index, Claude Opus 5.5 leads 58 to 46.
| Claude Opus 5.5 · Anthropic | MiMo-V2.6-Pro · Xiaomi | |
|---|---|---|
| Leaderboard rank | #2 | #7 |
| Score (0–100) | 85 | 81 |
| Tier | Frontier | Open weights |
| Price per 1M tokens | $4 in · $20 out | $0.43 in · $0.87 out |
| Context window | 1M | 1M |
| Open weights | No | Yes |
| Artificial Analysis Intelligence Index | 58 | 46 |
| Arena text score | 1507 | — |
| Humanity's Last Exam, Diamond (Scale) | 55.0 | — |
| Epoch Capabilities Index | 167 | — |
| Arena Text score | — | 1480 (rank 26) |
| Arena WebDev score | — | 1629 (rank 19) |
| Best for | Agentic coding, Long-running agents, Enterprise knowledge work | Self-hosted agentic coding, Cheap frontier-class batch reasoning, Replacing closed mid-tier models |
Choose Claude Opus 5.5 if…
- you need agentic coding
- you need long-running agents
- you need enterprise knowledge work
The model people actually ship agents on: top of the independent index, a price that does not need a budget meeting, and a community that complains mainly about how much it has to be used.
Caveats: Arena puts Gemini 4 Argon ahead on chat preference; the gap is inside two scores' error bars.
Choose MiMo-V2.6-Pro if…
- you need self-hosted agentic coding
- you need cheap frontier-class batch reasoning
- you need replacing closed mid-tier models
The strongest open-weight model right now and absurdly cheap for what it does. MIT-licensed 1T MoE that lands within a few points of Muse Spark and Grok 4.7. Slow-ish and verbose, so budget for latency and thinking tokens.
Caveats: Overthinks: long, repetitive reasoning traces on simple edits; AA flags it as verbose vs the median model. ~47 tok/s on the first-party API is slow next to Gemini Flash or Haiku-class models. Only 4k Arena votes so far; the rank is still settling.
What practitioners say
Claude Opus 5.5: The launch thread was the biggest Claude thread of the year on Hacker News, a port of the TypeScript compiler to Rust credited the model with a working build in ten hours, and a Vals AI materials-discovery run used it for agentic simulation. A 'has it been nerfed yet' tracker is the most-upvoted scepticism.
MiMo-V2.6-Pro: HN (1,130 points) was won over less by scores than by Xiaomi's transparency: a live training dashboard with loss curves, dropped datasets and running cost estimates. Users call it 'incredibly cheap' for Muse-Spark-level benchmarks and say it keeps DeepSeek and GLM 'in check'. Complaints are consistent: 'faster than DeepSeek but still much slower than leading models', and it 'seems to overthink way too much', producing huge reasoning traces for trivial edits. Several recommend it via OpenRouter rather than the Chinese first-party API.
Questions people ask
Which is better, Claude Opus 5.5 or MiMo-V2.6-Pro?
Claude Opus 5.5 scores higher on the Models at Work leaderboard (85 vs 81 out of 100). MiMo-V2.6-Pro is about 15× cheaper per blended million tokens ($0.54 vs $8). On Artificial Analysis' independent Intelligence Index, Claude Opus 5.5 leads 58 to 46.
When should I choose Claude Opus 5.5 over MiMo-V2.6-Pro?
Choose Claude Opus 5.5 for agentic coding, long-running agents, enterprise knowledge work. The model people actually ship agents on: top of the independent index, a price that does not need a budget meeting, and a community that complains mainly about how much it has to be used.
When should I choose MiMo-V2.6-Pro over Claude Opus 5.5?
Choose MiMo-V2.6-Pro for self-hosted agentic coding, cheap frontier-class batch reasoning, replacing closed mid-tier models. The strongest open-weight model right now and absurdly cheap for what it does. MIT-licensed 1T MoE that lands within a few points of Muse Spark and Grok 4.7. Slow-ish and verbose, so budget for latency and thinking tokens.
Which is cheaper, Claude Opus 5.5 or MiMo-V2.6-Pro?
Claude Opus 5.5 costs $4 per million input tokens and $20 per million output tokens on Anthropic's list price (Claude pricing, read Oct 11, 2026). MiMo-V2.6-Pro costs $0.43 per million input tokens and $0.87 per million output tokens on Xiaomi's list price (MiMo-V2.6-Pro - Artificial Analysis, read Oct 11, 2026).
Scores come from the Models at Work leaderboard: Score is 0 to 100 and computed, not typed: 55% independent evals (Artificial Analysis, Arena, Scale SEAL, Epoch, each scaled against its natural floor and the best score in this table, then averaged), 15% blended price on a fixed log scale ($0.05 per million is 100, $60 is 0), 15% practitioner sentiment from Signals and community threads, 15% operational fit (context window, open weights). A missing component drops out and the rest are reweighted. A model with no independent eval yet is provisional and ranks below every measured one. Within three points is a tie. Vendor-published figures are labelled and never counted. Prices are vendor list prices where published; blended figures assume three input tokens per output token.