Model comparison
Claude Haiku 5.5 vs Mercury
Claude Haiku 5.5 is the stronger model overall, scoring 49.5 to 37.6 on the Noometry Index.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in reasoning, where Claude Haiku 5.5 leads 35.2 to 17.5.
Side by side
| Claude Haiku 5.5 | Mercury | |
|---|---|---|
| Provider | Anthropic | Inception |
| Noometry Index | 49.5 | 37.6 |
| Released | 2026-10-07 | — |
| Weights | Proprietary | Proprietary |
| Context window | 1M | — |
| Max output | 128K | — |
| Input $ / M tokens | $0.10 | — |
| Output $ / M tokens | $0.50 | — |
| Results tracked | 9 | 9 |
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Category by category
Coding Claude Haiku 5.5 leads
Claude Haiku 5.5: 49.2 (#50), Mercury: 38.7 (#170)
| Benchmark | Claude Haiku 5.5 | Mercury |
|---|---|---|
| LMArena WebDev | 1587 | — |
| LMArena Coding | — | 1322 |
Reasoning Claude Haiku 5.5 leads
Claude Haiku 5.5: 35.2 (#69), Mercury: 17.5 (#293)
| Benchmark | Claude Haiku 5.5 | Mercury |
|---|---|---|
| Kagi LLM Benchmark | — | 21.6% |
| NYT Connections (extended) | 65.7% | — |
| LMArena Hard Prompts | — | 1285 |
| Mystery Game Puzzles | 30% | — |
Math Not comparable
Claude Haiku 5.5: 73.6 (#18), Mercury: —
| Benchmark | Claude Haiku 5.5 | Mercury |
|---|---|---|
| FrontierMath (Tiers 1-3) | 75.1% | — |
| FrontierMath Tier 4 | 46.3% | — |
| OTIS Mock AIME 2024-2025 | 98.9% | — |
Knowledge Not comparable
Claude Haiku 5.5: 50.8 (#70), Mercury: —
| Benchmark | Claude Haiku 5.5 | Mercury |
|---|---|---|
| GPQA Diamond | 89.6% | — |
| SimpleQA Verified | 23.8% | — |
Multimodal Not comparable
Claude Haiku 5.5: 43.7 (#21), Mercury: —
| Benchmark | Claude Haiku 5.5 | Mercury |
|---|---|---|
| Furniture Assembly | 47.5% | — |
Multilingual Not comparable
Claude Haiku 5.5: —, Mercury: 41.6 (#206)
| Benchmark | Claude Haiku 5.5 | Mercury |
|---|---|---|
| LMArena Non-English | — | 1260 |
Instruction Following Not comparable
Claude Haiku 5.5: —, Mercury: 65.2 (#224)
| Benchmark | Claude Haiku 5.5 | Mercury |
|---|---|---|
| LMArena Instruction Following | — | 1239 |
Long Context Not comparable
Claude Haiku 5.5: —, Mercury: 38.4 (#198)
| Benchmark | Claude Haiku 5.5 | Mercury |
|---|---|---|
| LMArena Longer Query | — | 1266 |
Writing & Preference Not comparable
Claude Haiku 5.5: —, Mercury: 46.2 (#221)
| Benchmark | Claude Haiku 5.5 | Mercury |
|---|---|---|
| LMArena Text | — | 1282 |
| LMArena Creative Writing | — | 1191 |
| LMArena Multi-Turn | — | 1282 |
Frequently asked questions
Is Claude Haiku 5.5 better than Mercury?
Claude Haiku 5.5 is the stronger model overall, scoring 49.5 to 37.6 on the Noometry Index.
Is Claude Haiku 5.5 or Mercury better for coding?
Claude Haiku 5.5 scores higher on coding benchmarks: 49.2 versus 38.7 in the Noometry coding category.
How many benchmarks do Claude Haiku 5.5 and Mercury share?
0 benchmarks have published results for both models. Claude Haiku 5.5 has 9 scored results on Noometry and Mercury has 9.