The two are evenly matched.Claude Fable 5 is better at coding; Haiku 5.5 at reasoning.
Scores updated · 8 tests both models report · How we compare
Where each one wins
Tests won in each of the two 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.
Reasoning rests on a single test.
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 Fable 5 pulls ahead
- Long, multi-file coding tasks in real codebasesSWE-bench Pro+15.2points ahead
- Fixes real GitHub issues in many programming languagesSWE-bench Multilingual+2.9points ahead
Where Haiku 5.5 pulls ahead
- Very hard expert questions across many subjectsHumanity's Last Exam+1.9points 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.
CodingClaude Fable 5
- SWE-bench ProClaude Fable 5 by 15.28064.8+15.2
- SWE-bench MultilingualClaude Fable 5 by 2.986.683.7+2.9
Other results5 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.
- SWE-bench MultimodalClaude Fable 5 by 23.454.130.7+23.4
- Terminal-Bench 4.0Claude Fable 5 by 5.344.539.2+5.3
- Program BenchClaude Fable 5 by 4.386.382+4.3
- Terminal-Bench-Science 0.1Claude Fable 5 by 4.124.720.6+4.1
- GDPval-AA 2.1Haiku 5.5 by 25 rating points15951620+25 rating
Questions people ask
Which is better, Claude Fable 5 or Haiku 5.5?
Claude Fable 5 and Haiku 5.5 each win one of the two areas where both have results. Claude Fable 5 wins coding; Haiku 5.5 wins reasoning.
Which is better for coding?
Claude Fable 5. It wins 2 of the 2 coding tests both models report; Haiku 5.5 wins none.
How do you compare the two?
We use the 8 benchmark tests both models have published scores on. The verdict counts the 3 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 5 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.