Claude Opus 4.8 is the stronger all-rounder.Hy4 is cheaper.
Scores updated · 19 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 89% 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 Opus 4.8 pulls ahead
- Research-level physics problemsCritPt+4points ahead
- Long, multi-file coding tasks in real codebasesSWE-bench Pro+3.5points ahead
- Long professional tasks in banking, consulting and lawAA ApexAgents+2.3points ahead
Where Hy4 pulls ahead
- Multi-step tasks using many real software toolsMCP Atlas+1.5points ahead
Every test, side by side
All 19 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingClaude Opus 4.8
- LMArena · WebDevHy4 by 75 rating points15561631+75 rating
- SWE-bench ProClaude Opus 4.8 by 3.569.265.7+3.5
- SWE-bench MultilingualClaude Opus 4.8 by 1.584.482.9+1.5
- Terminal-Bench 2.1tie84.685.4tie
AgentsEven
- AA ApexAgentsClaude Opus 4.8 by 2.339.437.1+2.3
- MCP AtlasHy4 by 1.582.283.7+1.5
ReasoningClaude Opus 4.8
- CritPtClaude Opus 4.8 by 420.916.9+4
- GPQA Diamondtie9292.3tie
Other results11 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 Opus 4.8 by 54.471.917.5+54.4
- ToolathlonHy4 by 14.259.974.1+14.2
- JobBenchHy4 by 13.348.461.7+13.3
- WideSearchHy4 by 1172.983.9+11
- NL2RepoClaude Opus 4.8 by 10.869.758.9+10.8
- DeepSWEHy4 by 6.35864.3+6.3
- SWE-MarathonHy4 by 5.92631.9+5.9
- Agents' Last ExamClaude Opus 4.8 by 2.925.722.8+2.9
- PostTrainBenchClaude Opus 4.8 by 1.637.235.6+1.6
- CyberGymtie78.878.4tie
- OfficeQA Protie66.266.2tie
Questions people ask
Which is better, Claude Opus 4.8 or Hy4?
Claude Opus 4.8 wins two of the three areas where both have results: coding and reasoning. Hy4 wins none, but costs 89% less. They are level on agents.
Which is better for coding?
Claude Opus 4.8. It wins 2 of the 4 coding tests both models report; Hy4 wins 1, and 1 is a tie.
Which is cheaper?
Claude Opus 4.8 costs $5.00 per million input tokens and $25.00 per million output tokens; Hy4 costs $0.83 and $2.50. That makes Hy4 about 89% cheaper for the same work.
How do you compare the two?
We use the 19 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 11 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.