Model comparison
GPT-5 Pro vs Mercury
GPT-5 Pro is the stronger model overall, scoring 46.4 to 37.6 on the Noometry Index.
Last verified . 1 shared benchmarks.
Summary
- They share 1 benchmark with published results for both. GPT-5 Pro scores higher in 2 categories and Mercury in 0 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5 Pro leads 38.9 to 17.5.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 76.8% for GPT-5 Pro and 21.6% for Mercury.
Side by side
| GPT-5 Pro | Mercury | |
|---|---|---|
| Provider | OpenAI | Inception |
| Noometry Index | 46.4 | 37.6 |
| Released | 2025-10-06 | — |
| Weights | Proprietary | Proprietary |
| Context window | 400K | — |
| Max output | 272K | — |
| Input $ / M tokens | $15 | — |
| Output $ / M tokens | $120 | — |
| Results tracked | 12 | 9 |
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Category by category
Coding GPT-5 Pro leads
GPT-5 Pro: 44.0 (#80), Mercury: 38.7 (#170)
| Benchmark | GPT-5 Pro | Mercury |
|---|---|---|
| WeirdML | 60.4% | — |
| LMArena Coding | — | 1322 |
| AlgoTune | 1.31 | — |
Reasoning GPT-5 Pro leads
GPT-5 Pro: 38.9 (#62), Mercury: 17.5 (#293)
| Benchmark | GPT-5 Pro | Mercury |
|---|---|---|
| Kagi LLM Benchmark | 76.8% | 21.6% |
| ARC-AGI-2 | 18.3% | — |
| SimpleBench | 61.6% | — |
| ARC-AGI-1 | 70.2% | — |
| EnigmaEval | 18.8% | — |
| LMArena Hard Prompts | — | 1285 |
| Epoch Capabilities Index | 150.28 | — |
Math Not comparable
GPT-5 Pro: 48.5 (#63), Mercury: —
| Benchmark | GPT-5 Pro | Mercury |
|---|---|---|
| FrontierMath (Tiers 1-3) | 55.8% | — |
| FrontierMath Tier 4 | 19.5% | — |
| FrontierMath Tier 4 (v1) | 14.6% | — |
Knowledge Not comparable
GPT-5 Pro: 56.7 (#42), Mercury: —
| Benchmark | GPT-5 Pro | Mercury |
|---|---|---|
| Humanity's Last Exam | 31.6% | — |
Multilingual Not comparable
GPT-5 Pro: —, Mercury: 41.6 (#206)
| Benchmark | GPT-5 Pro | Mercury |
|---|---|---|
| LMArena Non-English | — | 1260 |
Instruction Following Not comparable
GPT-5 Pro: —, Mercury: 65.2 (#224)
| Benchmark | GPT-5 Pro | Mercury |
|---|---|---|
| LMArena Instruction Following | — | 1239 |
Long Context Not comparable
GPT-5 Pro: —, Mercury: 38.4 (#198)
| Benchmark | GPT-5 Pro | Mercury |
|---|---|---|
| LMArena Longer Query | — | 1266 |
Writing & Preference Not comparable
GPT-5 Pro: —, Mercury: 46.2 (#221)
| Benchmark | GPT-5 Pro | Mercury |
|---|---|---|
| LMArena Text | — | 1282 |
| LMArena Creative Writing | — | 1191 |
| LMArena Multi-Turn | — | 1282 |
Frequently asked questions
Is GPT-5 Pro better than Mercury?
GPT-5 Pro is the stronger model overall, scoring 46.4 to 37.6 on the Noometry Index.
Is GPT-5 Pro or Mercury better for coding?
GPT-5 Pro scores higher on coding benchmarks: 44.0 versus 38.7 in the Noometry coding category.
How many benchmarks do GPT-5 Pro and Mercury share?
1 benchmark has published results for both models. GPT-5 Pro has 12 scored results on Noometry and Mercury has 9.