WhichAI.todayClaude Opus 5.5
Anthropic
Pick this when the code has to be right the first time.
Skip it for simple edits and quick boilerplate where faster, cheaper models suffice.
LMArena Code 1813; 89.9% on SWE-bench Pro
Claude Opus 5.5 vs MiMo-V2.6-Pro
Updated Nov 13, 2026. Checked daily.
The short answer
Claude Opus 5.5 ranks ahead for coding & software, writing & marketing. MiMo-V2.6-Pro ranks ahead for general & everyday.
Claude Opus 5.5
2 of 3 jobs ahead
Paid plan
MiMo-V2.6-Pro
1 of 3 jobs ahead
Free (limited)
Head to head, job by job
Each job ranks a #1, an alternative, and an open-weights pick from public leaderboards. Bars compare the two scores on that job's own signal.
Which one should you pick?
MiMo-V2.6-Pro
Xiaomi
Pick this when the draft cannot leave your own machines.
Skip a hosted demo if the draft includes unreleased product details.
Highest-rated open model on the Artificial Analysis Intelligence Index (46).
Price, access, and privacy
Claude Opus 5.5MiMo-V2.6-Pro
Cost
Pro is $20/month ($17/month billed annually); API is $4 per million input tokens and $20 per million output tokens.
Weights are free under MIT. API is about $0.44 per million input tokens and $0.87 per million output.
Free tier
Not on the free plan. Free Claude includes Haiku and Sonnet, not Opus.
The weights are free to download. Hosted use depends on Xiaomi's current studio limits.
Where to get it
Apps
- Claude, Pro ($20/month)
- Perplexity, Max ($200/month)
- Cursor, Premium ($30/month)
- GitHub Copilot, Copilot Pro ($10/month)
- Claude Code, Pro ($20/month)
- Hugging Face, Free (Free)
- Ollama, Free (Free)
Trains on chats
Anthropic says Free, Pro, and Max chats are used for training only if you allow it, and you choose at signup. The toggle has been reported as on by default, so check it. Settings, then Privacy. Turn off Help improve Claude.
No, if you download the weights and run them yourself. Hosted Xiaomi apps may differ. Run the open weights on your own machine when chats must stay private.
Try both with the same prompt
Claude Opus 5.5
Find the bug in this function, explain the cause, and give the fixed version.
MiMo-V2.6-Pro
Draft three headline options and one short paragraph for this announcement.
Want a sharper prompt? Build one for either model.
Ranking history
- Nov 12, 2026. Claude Fable 5.2 overtook Claude Opus 5.5. Humanity's Last Exam 74.3%.
- Nov 8, 2026. Gemini 4 Argon overtook Claude Opus 5.5. LMArena Creative Writing 1525
- Oct 24, 2026. Ranking method updated. Claude Opus 5.5 leads on the new signal. Writing now ranks on LMArena Creative Writing instead of the general text board. Claude Opus 5.5 leads that board (1520).
- Oct 23, 2026. Claude Opus 5.5 is the first leader on record. LMArena Code 1813; #1 SWE-bench Pro (89.9%)
- Oct 23, 2026. Claude Opus 5.5 is the first leader on record. Humanity's Last Exam 61.4%.
Questions
Is Claude Opus 5.5 or MiMo-V2.6-Pro better for coding & software?
Claude Opus 5.5 ranks ahead for coding & software on LMArena Code. Claude Opus 5.5 is the #1 pick (1813); MiMo-V2.6-Pro is not in today's top three.
Is Claude Opus 5.5 or MiMo-V2.6-Pro better for writing & marketing?
Claude Opus 5.5 ranks ahead for writing & marketing on LMArena Creative Writing. Claude Opus 5.5 is the alternative pick (1517); MiMo-V2.6-Pro is the open weights pick.
Is Claude Opus 5.5 or MiMo-V2.6-Pro better for general & everyday?
MiMo-V2.6-Pro ranks ahead for general & everyday on LMArena Text overall. Claude Opus 5.5 is not in today's top three; MiMo-V2.6-Pro is the open weights pick.
Which is cheaper, Claude Opus 5.5 or MiMo-V2.6-Pro?
Claude Opus 5.5: Pro is $20/month ($17/month billed annually); API is $4 per million input tokens and $20 per million output tokens. MiMo-V2.6-Pro: Weights are free under MIT. API is about $0.44 per million input tokens and $0.87 per million output.
Can I use Claude Opus 5.5 or MiMo-V2.6-Pro for free?
Claude Opus 5.5: Not on the free plan. Free Claude includes Haiku and Sonnet, not Opus. MiMo-V2.6-Pro: The weights are free to download. Hosted use depends on Xiaomi's current studio limits.
Which is more private, Claude Opus 5.5 or MiMo-V2.6-Pro?
Claude Opus 5.5 (Anthropic): Anthropic says Free, Pro, and Max chats are used for training only if you allow it, and you choose at signup. The toggle has been reported as on by default, so check it. MiMo-V2.6-Pro (Xiaomi): No, if you download the weights and run them yourself. Hosted Xiaomi apps may differ.