Model comparison
GPT-5.4 Pro vs Mercury
GPT-5.4 Pro is the stronger model overall, scoring 58.9 to 37.6 on the Noometry Index.
Last verified . 0 shared benchmarks.
Summary
- The widest gap is in reasoning, where GPT-5.4 Pro leads 70.7 to 17.5.
Side by side
| GPT-5.4 Pro | Mercury | |
|---|---|---|
| Provider | OpenAI | Inception |
| Noometry Index | 58.9 | 37.6 |
| Released | 2026-03-05 | — |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | — |
| Max output | 128K | — |
| Input $ / M tokens | $30 | — |
| Output $ / M tokens | $180 | — |
| Results tracked | 16 | 9 |
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Category by category
Coding GPT-5.4 Pro leads
GPT-5.4 Pro: 43.2 (#90), Mercury: 38.7 (#170)
| Benchmark | GPT-5.4 Pro | Mercury |
|---|---|---|
| WeirdML | 57.4% | — |
| LMArena Coding | — | 1322 |
Reasoning GPT-5.4 Pro leads
GPT-5.4 Pro: 70.7 (#13), Mercury: 17.5 (#293)
| Benchmark | GPT-5.4 Pro | Mercury |
|---|---|---|
| ARC-AGI-2 | 83.3% | — |
| SimpleBench | 74.1% | — |
| Kagi LLM Benchmark | — | 21.6% |
| ARC-AGI-1 | 94.5% | — |
| CritPt | 30% | — |
| Chess Puzzles | 58.6% | — |
| EnigmaEval | 23.8% | — |
| LMArena Hard Prompts | — | 1285 |
| Epoch Capabilities Index | 158.93 | — |
Math Not comparable
GPT-5.4 Pro: 72.4 (#22), Mercury: —
| Benchmark | GPT-5.4 Pro | Mercury |
|---|---|---|
| FrontierMath (Tiers 1-3) | 82.5% | — |
| FrontierMath Tier 4 | 58.5% | — |
| FrontierMath (Feb 2025 set) | 50% | — |
| FrontierMath Tier 4 (v1) | 37.5% | — |
Knowledge Not comparable
GPT-5.4 Pro: 68.3 (#7), Mercury: —
| Benchmark | GPT-5.4 Pro | Mercury |
|---|---|---|
| GPQA Diamond | 94.6% | — |
| Humanity's Last Exam | 44.3% | — |
| SimpleQA Verified | 46.3% | — |
| Vectara Hallucination Rate | 8.3% | — |
Multilingual Not comparable
GPT-5.4 Pro: —, Mercury: 41.6 (#206)
| Benchmark | GPT-5.4 Pro | Mercury |
|---|---|---|
| LMArena Non-English | — | 1260 |
Instruction Following Not comparable
GPT-5.4 Pro: —, Mercury: 65.2 (#224)
| Benchmark | GPT-5.4 Pro | Mercury |
|---|---|---|
| LMArena Instruction Following | — | 1239 |
Long Context Not comparable
GPT-5.4 Pro: —, Mercury: 38.4 (#198)
| Benchmark | GPT-5.4 Pro | Mercury |
|---|---|---|
| LMArena Longer Query | — | 1266 |
Writing & Preference Not comparable
GPT-5.4 Pro: —, Mercury: 46.2 (#221)
| Benchmark | GPT-5.4 Pro | Mercury |
|---|---|---|
| LMArena Text | — | 1282 |
| LMArena Creative Writing | — | 1191 |
| LMArena Multi-Turn | — | 1282 |
Frequently asked questions
Is GPT-5.4 Pro better than Mercury?
GPT-5.4 Pro is the stronger model overall, scoring 58.9 to 37.6 on the Noometry Index.
Is GPT-5.4 Pro or Mercury better for coding?
GPT-5.4 Pro scores higher on coding benchmarks: 43.2 versus 38.7 in the Noometry coding category.
How many benchmarks do GPT-5.4 Pro and Mercury share?
0 benchmarks have published results for both models. GPT-5.4 Pro has 16 scored results on Noometry and Mercury has 9.