Claude Fable 5 is the stronger all-rounder.Hy4 is cheaper.
Scores updated · 17 tests both models report · How we compare
Where each one wins
Tests won in each of the three 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.
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.
Hy4 costs 94% less for the same work.
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+14.3points ahead
- Research-level physics problemsCritPt+11.7points ahead
- Long professional tasks in banking, consulting and lawAA ApexAgents+6.2points ahead
Where Hy4 pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 17 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 14.38065.7+14.3
- SWE-bench MultilingualClaude Fable 5 by 3.786.682.9+3.7
- LMArena · WebDevtie16241632tie
- Terminal-Bench 2.1tie84.685.4tie
AgentsClaude Fable 5
- AA ApexAgentsClaude Fable 5 by 6.243.337.1+6.2
- MCP AtlasClaude Fable 5 by 184.783.7+1
ReasoningClaude Fable 5
- CritPtClaude Fable 5 by 11.728.616.9+11.7
- GPQA Diamondtie92.692.3tie
Other results9 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.
- Program BenchClaude Fable 5 by 68.886.317.5+68.8
- ToolathlonHy4 by 12.461.774.1+12.4
- OfficeQA ProHy4 by 8.357.966.2+8.3
- PostTrainBenchClaude Fable 5 by 5.841.435.6+5.8
- DeepSWEClaude Fable 5 by 5.77064.3+5.7
- JobBenchHy4 by 4.357.461.7+4.3
- SWE-MarathonClaude Fable 5 by 3.13531.9+3.1
- Agents' Last ExamClaude Fable 5 by 2.925.722.8+2.9
- WideSearchHy4 by 2.781.283.9+2.7
Questions people ask
Which is better, Claude Fable 5 or Hy4?
Claude Fable 5 wins all three areas where both have results: coding, agents and reasoning. Hy4 wins none, but costs 94% less.
Which is better for coding?
Claude Fable 5. It wins 2 of the 4 coding tests both models report; Hy4 wins none, and 2 are ties.
Which is cheaper?
Claude Fable 5 costs $10.00 per million input tokens and $50.00 per million output tokens; Hy4 costs $0.83 and $2.50. That makes Hy4 about 94% cheaper for the same work.
How do you compare the two?
We use the 17 benchmark tests both models have published scores on. The verdict counts the 8 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 9 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.