Model comparison
GPT-5.5 Pro vs Grok Build 0.1
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 36.4 on the Noometry Index. Grok Build 0.1 costs 54× less per token, which makes it the better buy when GPT-5.5 Pro's lead doesn't matter for your workload.
Last verified . 1 shared benchmarks.
Summary
- They share 1 benchmark with published results for both. GPT-5.5 Pro scores higher in 1 category and Grok Build 0.1 in 0 categories; one gap is clear of the uncertainty.
- The widest gap is in reasoning, where GPT-5.5 Pro leads 73.3 to 32.2.
- The biggest single-benchmark swing is CritPt: 30.6% for GPT-5.5 Pro and 9.1% for Grok Build 0.1.
- Grok Build 0.1 is cheaper at $1 / $2 per million input/output tokens, against $30 / $180 for GPT-5.5 Pro.
- GPT-5.5 Pro accepts more context: 1.05M tokens versus 256K.
Side by side
| GPT-5.5 Pro | Grok Build 0.1 | |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 64.3 | 36.4 |
| Released | 2026-04-23 | 2026-04-16 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 256K |
| Max output | 128K | 256K |
| Input $ / M tokens | $30 | $1 |
| Output $ / M tokens | $180 | $2 |
| Results tracked | 14 | 3 |
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Category by category
Coding Not comparable
GPT-5.5 Pro: —, Grok Build 0.1: 43.1 (#91)
| Benchmark | GPT-5.5 Pro | Grok Build 0.1 |
|---|---|---|
| SciCode | — | 50.2% |
Agentic & Tool Use Not comparable
GPT-5.5 Pro: —, Grok Build 0.1: 22.7 (#129)
| Benchmark | GPT-5.5 Pro | Grok Build 0.1 |
|---|---|---|
| GBAEval | — | 2.4% |
Reasoning GPT-5.5 Pro leads
GPT-5.5 Pro: 73.3 (#10), Grok Build 0.1: 32.2 (#77)
| Benchmark | GPT-5.5 Pro | Grok Build 0.1 |
|---|---|---|
| CritPt | 30.6% | 9.1% |
| ARC-AGI-2 | 84.6% | — |
| SimpleBench | 76.9% | — |
| ARC-AGI-1 | 96.5% | — |
| Chess Puzzles | 64% | — |
| DTBench | 96% | — |
| LMCA | 53.9% | — |
| Epoch Capabilities Index | 162.07 | — |
Math Not comparable
GPT-5.5 Pro: 84.0 (#10), Grok Build 0.1: —
| Benchmark | GPT-5.5 Pro | Grok Build 0.1 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 87.7% | — |
| FrontierMath Tier 4 | 78% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| FrontierMath (Feb 2025 set) | 52.4% | — |
| FrontierMath Tier 4 (v1) | 39.6% | — |
Knowledge Not comparable
GPT-5.5 Pro: 64.1 (#19), Grok Build 0.1: —
| Benchmark | GPT-5.5 Pro | Grok Build 0.1 |
|---|---|---|
| GPQA Diamond | 93.9% | — |
Frequently asked questions
Is GPT-5.5 Pro better than Grok Build 0.1?
GPT-5.5 Pro is the stronger model overall, scoring 64.3 to 36.4 on the Noometry Index. Grok Build 0.1 costs 54× 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 Build 0.1?
Grok Build 0.1 is cheaper. It lists at $1 per million input tokens and $2 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 256K.
How many benchmarks do GPT-5.5 Pro and Grok Build 0.1 share?
1 benchmark has published results for both models. GPT-5.5 Pro has 14 scored results on Noometry and Grok Build 0.1 has 3.