Claude Opus 4.5 vs Grok Code Fast 1
Benchmarks, API pricing and specs, head to head. Data updated 2026-06-10.
Claude Opus 4.5
Anthropic · Nov 2025
The November 2025 Opus that cut flagship pricing 3x to $5/$25 and was the first model past 80% on SWE-bench Verified.
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
Claude Opus 4.5 wins 1 of the 1 benchmarks these models share, against 0 for Grok Code Fast 1. On price the gap is dramatic: Grok Code Fast 1 works out roughly 19x cheaper per blended million tokens. Grok Code Fast 1 also takes 256K of context versus 200K for Claude Opus 4.5.
Benchmark head-to-head 1–0
Specs & pricing
| Claude Opus 4.5 | Grok Code Fast 1 | |
|---|---|---|
| modhub Index | — | — |
| Input price / 1M | $5 | $0.2 |
| Output price / 1M | $25 | $1.5 |
| Context window | 200K | 256K |
| Max output | 64K | — |
| Open weights | no | no |
| Reasoning model | yes | yes |
| Multimodal input | text, image | text |
| Knowledge cutoff | Mar 2025 | Aug 2025 |
| Released | Nov 2025 | Aug 2025 |
| Example monthly cost* | $87.50 | $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, Claude Opus 4.5 or Grok Code Fast 1?
- Claude Opus 4.5 wins 1 of the 1 benchmarks these models share, against 0 for Grok Code Fast 1. On price the gap is dramatic: Grok Code Fast 1 works out roughly 19x cheaper per blended million tokens. Grok Code Fast 1 also takes 256K of context versus 200K for Claude Opus 4.5.
- Which is cheaper, Claude Opus 4.5 or Grok Code Fast 1?
- Claude Opus 4.5 costs $5/$25 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 $87.50 versus $4.25.
- Which model is better for coding, Claude Opus 4.5 or Grok Code Fast 1?
- On SWE-bench Verified — the standard agentic-coding benchmark — Claude Opus 4.5 scores 80.9% versus 70.8% for Grok Code Fast 1, making Claude Opus 4.5 the stronger pick for coding agents.
More comparisons
Claude Opus 4.5 vs GPT-5.5Grok Code Fast 1 vs GPT-5.5Claude Opus 4.5 vs GPT-5.2Grok Code Fast 1 vs GPT-5.2Claude Opus 4.5 vs GPT-5.1Grok Code Fast 1 vs GPT-5.1Claude Opus 4.5 vs GPT-5Grok Code Fast 1 vs GPT-5Claude Opus 4.5 vs GPT-5 miniGrok Code Fast 1 vs GPT-5 miniClaude Opus 4.5 vs OpenAI o3Grok Code Fast 1 vs OpenAI o3