Claude Opus 5 vs Grok 4.5: Specs & Benchmark Comparison
Claude Opus 5 is developed by Anthropic, while Grok 4.5 comes from xAI. Both were released in July 2026.
The two models share 3 published benchmarks. Claude Opus 5 leads on 3 of them. The widest gaps are on Terminal-Bench 4.0, where Claude Opus 5 scores 51.8% against 12.4%; DeepSWE 1.1, where Claude Opus 5 scores 68.8% against 54.0%. Averaged across everything we track, Claude Opus 5 sits at 55.0% and Grok 4.5 at 52.9%.
Grok 4.5 is the cheaper API at $2 per million input tokens and $6 per million output tokens, roughly 3 times cheaper than Claude Opus 5 at $5 and $25. Claude Opus 5 takes the larger context window at 1M tokens, compared with 500K for Grok 4.5. Both accept text and images as input.
| Characteristic | Claude Opus 5 | Grok 4.5 |
|---|---|---|
| Company | Anthropic | xAI |
| Release Date | July 24, 2026 | July 16, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 500K |
| Context (output) | 128K | — |
| Input Price / 1M | $5.00 | $2.00 |
| Output Price / 1M | $25.00 | $6.00 |
| Average Score | 55.0% | 52.9% |
| Benchmarks | ||
| Terminal-Bench 4.0 | 51.8% | 12.4% |
| DeepSWE 1.1 | 68.8% | 54.0% |
| FrontierCode 1.1 | 53.4% | 42.4% |
Visual Benchmark Comparison
Verdict
Both models show equal results — the choice depends on your specific use case.
Both models show comparable average scores: Claude Opus 5 — 0.5, Grok 4.5 — 0.5.
Grok 4.5 is 3.8x cheaper: input $2.00/1M vs $5.00/1M tokens.
Claude Opus 5 supports a larger context: 1M vs 500K tokens.
Both models were released around the same time: 7/24/2026 and 7/16/2026.
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Frequently Asked Questions
Which is better for coding — Claude Opus 5 or Grok 4.5?
Which model is cheaper — Claude Opus 5 or Grok 4.5?
Which has a larger context window — Claude Opus 5 or Grok 4.5?
The Claude Opus 5 and Grok 4.5 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Claude Opus 5 or Grok 4.5 page. See also the complete list of AI model comparisons.