Model comparison
GPT-5.5 Pro vs Grok 4.6
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 56.9 on the Noometry Index. Grok 4.6 costs 23× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Last verified . 12 shared benchmarks.
Summary
- They share 12 benchmarks with published results for both. GPT-5.5 Pro scores higher in 3 categories and Grok 4.6 in 0 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.5 Pro leads 84.0 to 67.0.
- The biggest single-benchmark swing is FrontierMath Tier 4: 78% for GPT-5.5 Pro and 31.7% for Grok 4.6.
- Grok 4.6 is cheaper at $2 / $6 per million input/output tokens, against $30 / $180 for GPT-5.5 Pro.
- GPT-5.5 Pro accepts more context: 1.05M tokens versus 500K.
Side by side
| GPT-5.5 Pro | Grok 4.6 | |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 64.3 | 56.9 |
| Released | 2026-04-23 | 2026-08-12 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 500K |
| Max output | 128K | 500K |
| Input $ / M tokens | $30 | $2 |
| Output $ / M tokens | $180 | $6 |
| Results tracked | 14 | 49 |
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Category by category
Coding Not comparable
GPT-5.5 Pro: —, Grok 4.6: 58.5 (#16)
| Benchmark | GPT-5.5 Pro | Grok 4.6 |
|---|---|---|
| DeepSWE | — | 67.5% |
| FrontierCode | — | 48% |
| CursorBench | — | 41.4% |
| LMArena WebDev | — | 1617 |
| FrontierSWE | — | 25.3% |
| SciCode | — | 56.5% |
| WeirdML | — | 67.3% |
| LMArena Coding | — | 1465 |
| ALE-Bench | — | 1,508 |
Agentic & Tool Use Not comparable
GPT-5.5 Pro: —, Grok 4.6: 39.4 (#27)
| Benchmark | GPT-5.5 Pro | Grok 4.6 |
|---|---|---|
| APEX-Agents | — | 65.3% |
| GDP.pdf | — | 17.2% |
| Vending-Bench 2 | — | 9,047 |
Reasoning GPT-5.5 Pro leads
GPT-5.5 Pro: 73.3 (#10), Grok 4.6: 61.4 (#20)
| Benchmark | GPT-5.5 Pro | Grok 4.6 |
|---|---|---|
| ARC-AGI-2 | 84.6% | 67.1% |
| SimpleBench | 76.9% | 75.9% |
| ARC-AGI-1 | 96.5% | 87.5% |
| CritPt | 30.6% | 19.7% |
| Chess Puzzles | 64% | 40% |
| DTBench | 96% | 97.3% |
| LMCA | 53.9% | 48.5% |
| Epoch Capabilities Index | 162.07 | 156.44 |
| NYT Connections (extended) | — | 80% |
| EBR-Bench | — | 30.5% |
| LMArena Hard Prompts | — | 1447 |
| Mystery Game Puzzles | — | 34% |
Math GPT-5.5 Pro leads
GPT-5.5 Pro: 84.0 (#10), Grok 4.6: 67.0 (#24)
| Benchmark | GPT-5.5 Pro | Grok 4.6 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 87.7% | 66% |
| FrontierMath Tier 4 | 78% | 31.7% |
| OTIS Mock AIME 2024-2025 | 100% | 99.2% |
| ProofBench | — | 51% |
| LMArena Math | — | 1423 |
| FrontierMath (Feb 2025 set) | 52.4% | — |
| FrontierMath Tier 4 (v1) | 39.6% | — |
Knowledge Too close to call
GPT-5.5 Pro: 64.1 (#19), Grok 4.6: 63.3 (#20)
| Benchmark | GPT-5.5 Pro | Grok 4.6 |
|---|---|---|
| GPQA Diamond | 93.9% | 94% |
| SimpleQA Verified | — | 49.3% |
| LMArena Expert | — | 1467 |
Multimodal Not comparable
GPT-5.5 Pro: —, Grok 4.6: 43.6 (#23)
| Benchmark | GPT-5.5 Pro | Grok 4.6 |
|---|---|---|
| LMArena Vision | — | 1263 |
| Blueprint-Bench 2 | — | 33.2% |
| Furniture Assembly | — | 40% |
| LMArena Document | — | 1452 |
Multilingual Not comparable
GPT-5.5 Pro: —, Grok 4.6: 53.0 (#74)
| Benchmark | GPT-5.5 Pro | Grok 4.6 |
|---|---|---|
| LMArena Non-English | — | 1420 |
| LMArena Chinese | — | 1480 |
| LMArena French | — | 1461 |
| LMArena German | — | 1431 |
| LMArena Japanese | — | 1376 |
| LMArena Korean | — | 1397 |
| LMArena Russian | — | 1422 |
| LMArena Spanish | — | 1404 |
Instruction Following Not comparable
GPT-5.5 Pro: —, Grok 4.6: 75.4 (#63)
| Benchmark | GPT-5.5 Pro | Grok 4.6 |
|---|---|---|
| LMArena Instruction Following | — | 1431 |
Long Context Not comparable
GPT-5.5 Pro: —, Grok 4.6: 44.5 (#66)
| Benchmark | GPT-5.5 Pro | Grok 4.6 |
|---|---|---|
| LMArena Longer Query | — | 1454 |
Writing & Preference Not comparable
GPT-5.5 Pro: —, Grok 4.6: 62.3 (#80)
| Benchmark | GPT-5.5 Pro | Grok 4.6 |
|---|---|---|
| LMArena Text | — | 1428 |
| LMArena Creative Writing | — | 1428 |
| LMArena Multi-Turn | — | 1425 |
Frequently asked questions
Is GPT-5.5 Pro better than Grok 4.6?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 56.9 on the Noometry Index. Grok 4.6 costs 23× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Which is cheaper, GPT-5.5 Pro or Grok 4.6?
Grok 4.6 is cheaper. It lists at $2 per million input tokens and $6 per million output tokens; GPT-5.5 Pro lists at $30 and $180.
Which has the bigger context window?
GPT-5.5 Pro does, with 1.05M tokens against 500K.
How many benchmarks do GPT-5.5 Pro and Grok 4.6 share?
12 benchmarks have published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Grok 4.6 has 49.