Claude Opus 4.5 vs MAI-Code-1-Flash
Wins 2 of 4 areas
Reasoning · Math
Wins 1 of 4 areas
Following instructions
Claude Opus 4.5 wins more areas, narrowly.MAI-Code-1-Flash is better at following instructions.
Scores updated · 8 tests both models report · How we compare
Where each one wins
Tests won in each of the four 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.
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.
The biggest differences
The tests each model wins by the widest margin, up to three each. Scores are out of 100.
Where Claude Opus 4.5 pulls ahead
- Very hard expert questions across many subjectsHumanity's Last Exam+12.1points ahead
- Fixes real GitHub issues in Python projectsSWE-bench Verified+9.3points ahead
- US invitational high-school math exam problemsAIME 2026+2.6points ahead
Where MAI-Code-1-Flash pulls ahead
- Fixes real GitHub issues in many programming languagesSWE-bench Multilingual+58.5points ahead
- Follows unfamiliar, precisely checkable instructionsIFBench+17points ahead
Every test, side by side
All 8 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingEven
- SWE-bench MultilingualMAI-Code-1-Flash by 58.5765.5+58.5
- SWE-bench VerifiedClaude Opus 4.5 by 9.380.971.6+9.3
- SWE-bench Protie5251.2tie
ReasoningClaude Opus 4.5
- Humanity's Last ExamClaude Opus 4.5 by 12.130.118+12.1
- GPQA DiamondClaude Opus 4.5 by 286.684.6+2
Following instructionsMAI-Code-1-Flash
- IFBenchMAI-Code-1-Flash by 175875+17
Other results1 test, 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.
- Terminal-Bench 2.0Claude Opus 4.5 by 4.559.354.8+4.5
Questions people ask
Which is better, Claude Opus 4.5 or MAI-Code-1-Flash?
Claude Opus 4.5 wins two of the four areas where both have results: reasoning and math. MAI-Code-1-Flash wins following instructions. They are level on coding.
Which is better for coding?
Neither. They win 1 coding test each of the 3 both models report, and 1 is a tie.
How do you compare the two?
We use the 8 benchmark tests both models have published scores on. The verdict counts the 7 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 1 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.