GPT-5.5 Pro vs Grok Code Fast 1
Benchmarks, API pricing and specs, head to head. Data updated 2026-06-10.
GPT-5.5 Pro
OpenAI · Apr 2026
The maximum-compute tier of GPT-5.5 for the hardest research, math and engineering problems, at a steep per-token premium.
Grok Code Fast 1
xAI · Aug 2025
A speed-first coding model built for agentic IDE loops, popular as a cheap fast tier in Cursor and similar tools.
The verdict
These two models don't yet share verified results on the benchmarks we track, so judge them on specs, pricing and intended use. On price the gap is dramatic: Grok Code Fast 1 works out roughly 129x cheaper per blended million tokens. GPT-5.5 Pro also takes 1M of context versus 256K for Grok Code Fast 1.
Specs & pricing
| GPT-5.5 Pro | Grok Code Fast 1 | |
|---|---|---|
| modhub Index | — | — |
| Input price / 1M | $30 | $0.2 |
| Output price / 1M | $180 | $1.5 |
| Context window | 1M | 256K |
| Max output | 128K | — |
| Open weights | no | no |
| Reasoning model | yes | yes |
| Multimodal input | text, image | text |
| Knowledge cutoff | Jan 2026 | Aug 2025 |
| Released | Apr 2026 | Aug 2025 |
| Example monthly cost* | $570.00 | $4.25 |
* 10M input + 1.5M output tokens per month at list prices, no caching. Green = better value on that row.
Frequently asked questions
- Which is better, GPT-5.5 Pro or Grok Code Fast 1?
- These two models don't yet share verified results on the benchmarks we track, so judge them on specs, pricing and intended use. On price the gap is dramatic: Grok Code Fast 1 works out roughly 129x cheaper per blended million tokens. GPT-5.5 Pro also takes 1M of context versus 256K for Grok Code Fast 1.
- Which is cheaper, GPT-5.5 Pro or Grok Code Fast 1?
- GPT-5.5 Pro costs $30/$180 per million input/output tokens, while Grok Code Fast 1 costs $0.2/$1.5. For a typical workload of 10M input and 1.5M output tokens per month, that's $570.00 versus $4.25.
- Which model is better for coding, GPT-5.5 Pro or Grok Code Fast 1?
- We don't yet track SWE-bench Verified results for both models; check their individual pages for coding-related scores.
More comparisons
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