Claude Sonnet 4.5 vs MiMo V2 Flash
Wins 4 of 7 areas
Coding · Agents · Facts · Long documents
Wins 3 of 7 areas
Reasoning · Math · Following instructions
Claude Sonnet 4.5 wins more areas, narrowly.MiMo V2 Flash is cheaper and better at reasoning.
Scores updated · 37 tests both models report · How we compare
Where each one wins
Tests won in each of the seven areas where both have results. Each piece is one test, so a longer bar means more evidence; grey means the two scored within a point of each other.
- FactsGetting facts right instead of making them up20Claude Sonnet 4.52 of 2 tests
- Long documentsFinding answers in very long texts20Claude Sonnet 4.52 of 2 tests
- CodingWriting and fixing software43Claude Sonnet 4.54 of 7 tests
- AgentsCarrying out multi-step tasks on its own21Claude Sonnet 4.52 of 3 tests
- ReasoningHard problems that need careful thinking03MiMo V2 Flash3 of 3 tests
- MathCompetition and research-level math01MiMo V2 Flash1 of 1 test
- Following instructionsDoing exactly what it is asked01MiMo V2 Flash1 of 1 test
Math and following instructions rest on a single test each.
What it costs
Prices per million tokens, roughly 750,000 words. The bars show the cost of a million tokens read plus a million written.
MiMo V2 Flash costs 98% less for the same work.
The biggest differences
The three tests each model wins by the widest margin. Scores are out of 100.
Where Claude Sonnet 4.5 pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+44.3points ahead
- Customer-service tasks in a simulated bankτ-Bench V3 · Banking+21.4points ahead
- Real work tasks from 44 professionsGDPVal+13.9points ahead
Where MiMo V2 Flash pulls ahead
- Finds hard-to-locate facts by browsing the webBrowseComp+34.2points ahead
- Recent programming contest problemsLiveCodeBench v6+16.6points ahead
- Olympiad math problems with short answersIMOAnswerBench+15points ahead
Every test, side by side
All 37 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Sonnet 4.5
- LiveCodeBench v6MiMo V2 Flash by 16.66480.6+16.6
- Terminal-Bench HardClaude Sonnet 4.5 by 7.635.628+7.6
- SciCodeClaude Sonnet 4.5 by 6.345.739.4+6.3
- LMArena · WebDevClaude Sonnet 4.5 by 62 rating points13931331+62 rating
- Terminal-Bench 2.1MiMo V2 Flash by 655.861.8+6
- SWE-bench MultilingualMiMo V2 Flash by 4.76771.7+4.7
- SWE-bench VerifiedClaude Sonnet 4.5 by 3.877.273.4+3.8
AgentsClaude Sonnet 4.5
- BrowseCompMiMo V2 Flash by 34.224.158.3+34.2
- τ-Bench V3 · BankingClaude Sonnet 4.5 by 21.424.53.1+21.4
- GDPValClaude Sonnet 4.5 by 13.920.56.6+13.9
ReasoningMiMo V2 Flash
- Humanity's Last ExamMiMo V2 Flash by 517.822.8+5
- CritPtMiMo V2 Flash by 3.21.14.3+3.2
- GPQA DiamondMiMo V2 Flash by 1.283.484.6+1.2
FactsClaude Sonnet 4.5
- AA-Omniscience · Non-hallucinationClaude Sonnet 4.5 by 44.350.96.6+44.3
- AA-Omniscience · AccuracyClaude Sonnet 4.5 by 8.132.924.8+8.1
Long documentsClaude Sonnet 4.5
- AA-LCRClaude Sonnet 4.5 by 1.672.370.7+1.6
- LongBench v2Claude Sonnet 4.5 by 1.261.860.6+1.2
Following instructionsMiMo V2 Flash
- IFBenchMiMo V2 Flash by 6.957.364.2+6.9
Other results18 tests, not counted
Tests outside the eight areas. They are not counted above: several are summary scores built from other tests, or the same test under another name.
- AA-OmniscienceClaude Sonnet 4.5 by 45.2-0.1-45.4+45.2
- xbench-DeepSearchClaude Sonnet 4.5 by 226644+22
- Terminal-BenchClaude Sonnet 4.5 by 19.55030.5+19.5
- τ²-BenchClaude Sonnet 4.5 by 17.79880.3+17.7
- HMMT Feb. 2025MiMo V2 Flash by 16.967.584.4+16.9
- τ²-Bench Telecom (AA run)MiMo V2 Flash by 16.978.195+16.9
- Terminal-Bench 2.0Claude Sonnet 4.5 by 11.55038.5+11.5
- HMMT 2025MiMo V2 Flash by 9.874.684.4+9.8
- MRCRClaude Sonnet 4.5 by 9.755.445.7+9.7
- Arena-Hard (Creative Writing)MiMo V2 Flash by 9.576.786.2+9.5
- HMMT Nov. 2025MiMo V2 Flash by 9.381.791+9.3
- Arena-Hard (Hard Prompt)Claude Sonnet 4.5 by 9.263.354.1+9.2
- BrowseComp-ZHMiMo V2 Flash by 8.842.451.2+8.8
- AIME 2025MiMo V2 Flash by 7.18794.1+7.1
- AA Agentic IndexClaude Sonnet 4.5 by 5.517.512+5.5
- MMLU-ProClaude Sonnet 4.5 by 2.687.584.9+2.6
- Artificial Analysis Coding IndexClaude Sonnet 4.5 by 2.352.149.8+2.3
- AA Intelligencetie20.720.8tie
Questions people ask
Which is better, Claude Sonnet 4.5 or MiMo V2 Flash?
Claude Sonnet 4.5 wins four of the seven areas where both have results: coding, agents, facts and long documents. MiMo V2 Flash wins reasoning, math and following instructions, and costs 98% less.
Which is better for coding?
Claude Sonnet 4.5. It wins 4 of the 7 coding tests both models report; MiMo V2 Flash wins 3.
Which is cheaper?
Claude Sonnet 4.5 costs $3.00 per million input tokens and $15.00 per million output tokens; MiMo V2 Flash costs $0.10 and $0.30. That makes MiMo V2 Flash about 98% cheaper for the same work.
How do you compare the two?
We use the 37 benchmark tests both models have published scores on. The verdict counts the 19 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 18 are listed but not counted, because several are summary scores or repeat a test. Each score is the one shown on the model's own page.