Claude Opus 5 vs Grok 4.5
Side-by-side comparison of API pricing, specs, benchmarks, and capabilities
| Specification |
by Anthropic
|
by xAI
|
|---|---|---|
| Overview | ||
| Status | Current flagship | Current flagship |
| Released | Jul 24, 2026 | Jul 8, 2026 |
| Pricing per million tokens | ||
| Input | $5.00/Mtok | $2.00/Mtok |
| Output | $25.00/Mtok | $6.00/Mtok |
| Blended avg | $15.00/Mtok | $4.00/Mtok |
| Cached input | $0.500/Mtok | — |
| Specifications | ||
| Context window | 1M tokens | 500K tokens |
| Parameters | Proprietary | Proprietary |
| Speed (TPS) | — | — |
| Modalities | ||
| Input |
textimage
|
textimage
|
| Benchmarks sources: Vellum LLM Leaderboard / Artificial Analysis, LMSYS Chatbot Arena (UC Berkeley), xAI Grok 4.5 launch post | ||
| Independent composite scores measured for both models — each on its own scale | ||
| AA Intelligence Index | 60.7 | 53.8 |
| AA Agentic Index | 55.3 | 45.7 |
| AA-Omniscience Index (−100–100) | 31.3 | 26.4 |
| GDPval-AA v2 | 1861.5 ELO | 1527.9 ELO |
| LMSYS Chatbot Arena | — | 1467.8 ELO |
| Per-benchmark results no per-benchmark score is published for both models — the composites above are what compares them | ||
| Avg benchmark score | 77.8 | — |
| Perf / dollar | 5.2 | — |
| Terminal-Bench 2.1 | — | 83.3 vendor |
| BrowseComp | 90.8 | — |
| Humanity's Last Exam | 64.7 | — |
| AutoBench | 26 | — |
| Providers | ||
| Available from |
Anthropic — $5.00/$25.00/Mtok
|
xAI — $2.00/$6.00/Mtok
|
Cost at scale
1M tokens · 50/50 input/output| Volume | Claude Opus 5 | Grok 4.5 | Savings |
|---|---|---|---|
| 1M tokens | $15 | $4 | $11 (73.3%) |
| 10M tokens | $150 | $40 | $110 (73.3%) |
| 100M tokens | $1500 | $400 | $1100 (73.3%) |
| 1000M tokens | $15000 | $4000 | $11000 (73.3%) |
The cheaper option here — Grok 4.5 costs $4.00/Mtok blended on xAI.
Summary
Claude Opus 5 by Anthropic costs $5.00/Mtok input and $25.00/Mtok output, with a 1M-token context window. It supports text, image input.
Grok 4.5 by xAI costs $2.00/Mtok input and $6.00/Mtok output, with a 500K-token context window. It supports text, image input.
On a blended cost basis, Grok 4.5 is 73.3% cheaper than Claude Opus 5.
The two aren't directly comparable on average benchmark score: Claude Opus 5 has published per-benchmark results, while Grok 4.5 does not yet — it is measured today on independent composites (see the table above).
Note: Pricing is per million tokens. Actual costs vary with usage patterns, prompt caching, and batch discounts. Always verify against official provider pricing pages.