Claude Sonnet 5 vs Grok 4.5
Claude Sonnet 5 and Grok 4.5 are both current production-tier models. Grok 4.5 is meaningfully cheaper at $2 / $6 per 1M. Claude Sonnet 5 leads on long-context retrieval, instruction following, tool use.
Specs side by side
| Metric | Anthropic Claude Sonnet 5 | xAI Grok 4.5 |
|---|---|---|
| Input price (per 1M) | $3 | $2 |
| Output price (per 1M) | $15 | $6 |
| Context window | 1M tokens | 500k tokens |
| Speed tier | balanced | balanced |
| Open weights | No | No |
| EU region | Yes | No |
| Free tier | No | No |
| Prompt caching | Yes | Yes |
| Vision input | Yes | Yes |
| Extended thinking | Yes | Yes |
When to choose each
Choose Claude Sonnet 5 if…
- You need 1M context (2× more than Grok 4.5)
- EU data residency is required
- HIPAA eligibility is required
- Long-context retrieval is central to your workload
- Instruction following is central to your workload
Choose Grok 4.5 if…
- Cost is a priority ($2 / $6 per 1M vs $3 / $15 per 1M)
Benchmark delta
Claude Sonnet 5 leads on
- Long-context retrieval
- Instruction following
- Tool use
Grok 4.5 leads on
Grok 4.5 has no meaningful benchmark lead in this pair.
FAQ — Claude Sonnet 5 vs Grok 4.5
Claude Sonnet 5 vs Grok 4.5 — which is better?
Claude Sonnet 5 and Grok 4.5 are both current production-tier models. Grok 4.5 is meaningfully cheaper at $2 / $6 per 1M. Claude Sonnet 5 leads on long-context retrieval, instruction following, tool use. The right pick depends on your use case — see "When to choose each" above for a data-driven decision.
How does Claude Sonnet 5 pricing compare to Grok 4.5?
Claude Sonnet 5 costs $3 / $15 per 1M vs Grok 4.5 at $2 / $6 per 1M. Grok 4.5 is cheaper on output tokens by roughly 150%. Both support prompt caching, which reduces effective cost by 80-90% on repeat system prompts.
Does Claude Sonnet 5 or Grok 4.5 have the bigger context window?
Claude Sonnet 5 has a 1M-token context window — 2× the 500k context of Grok 4.5. Enough for entire codebases, books, or multi-document RAG.
Is there a free tier for Claude Sonnet 5 or Grok 4.5?
Claude Sonnet 5: no — Default model on Claude.ai Free/Pro web chat; API requires paid credits. Grok 4.5: no — X Premium / SuperGrok includes Grok web chat; API is paid.
Which is better for coding — Claude Sonnet 5 or Grok 4.5?
Claude Sonnet 5 leads on coding benchmarks (Claude Sonnet 5: 95/100, Grok 4.5: 94/100). For production coding agents also weigh tool-use performance — Claude Sonnet 5 scores 96, Grok 4.5 scores 92.