GPT-5.5 Instant vs Grok 4.6
GPT-5.5 Instant (OpenAI) and Grok 4.6 (xAI) compared on benchmarks, pricing, context window, and use-case rankings.
- Grok 4.6 leads on overall intelligence (ECI 156 vs 143).
- Grok 4.6 ranks higher for coding (92th vs 78th percentile).
| Attribute | GPT-5.5 Instant | Grok 4.6 |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 143 | 156 |
| Coding | 78 | 92 |
| Math | 7 | 91 |
| Reasoning & Knowledge | 33 | 73 |
| Agentic & Tools | 16 | 84 |
| Specifications | ||
| Developer | OpenAI | xAI |
| Family | GPT | Grok |
| Released | May 5, 2026 | Aug 12, 2026 |
| Parameters | — | — |
| Availability | API access | API access |
| Context window | — | 500K |
| Price — $/M input | — | $2.00 |
| Price — $/M output | — | $6.00 |
| Inputs | — | text, image, file |
| Outputs | — | text |
| Benchmarks | ||
| AIME 2024/2025 | 68% | 99% |
| GPQA Diamond | 83% | 94% |
| Humanity's Last Exam | 20% | 43% |
| SciCode | 53% | 56% |
| SimpleQA Verified | 38% | 49% |
| τ²-bench | 49% | — |
| APEX | — | 41% |
| ARC-AGI | — | 88% |
| ARC-AGI-2 | — | 67% |
| SimpleBench | — | 76% |
| WebDev Arena | — | 1629 |
| WeirdML | — | 67% |
Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.
Frequently asked questions
Is GPT-5.5 Instant better than Grok 4.6?
On Epoch AI's Capabilities Index, Grok 4.6 scores higher (156) than GPT-5.5 Instant (143). The right pick depends on your task — compare their coding, math, and reasoning scores in the table above.
Which is better for coding, GPT-5.5 Instant or Grok 4.6?
Across coding benchmarks like SWE-bench Verified and Terminal-Bench, Grok 4.6 ranks higher — 92th vs 78th percentile among the models tracked on Model Beat.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.