Claude 4 Sonnet vs Claude Opus 4.5
API pricing, context window and capabilities for Claude 4 Sonnet and Claude Opus 4.5, side by side. Prices are the cheapest listed serving route per 1M tokens, from LiteLLM and OpenRouter.
Verdict
computed from the published numbersClaude 4 Sonnet wins on price. Claude Opus 4.5 wins on intelligence and on context window. Benchmark data is unavailable for one or both models.
Price
Claude 4 Sonnet
Terminal-Bench
Not called
Intelligence
Claude Opus 4.5
Context window
Claude Opus 4.5
Key takeaways
who wins on what, from the published numbersClaude 4 Sonnet wins
- Cheaper input ($3.00 vs $5.00 /1M)
- Cheaper output ($15.00 vs $25.00 /1M)
- Higher max output (200K vs 64K)
Claude Opus 4.5 wins
- Larger context window (200K vs 410K)
- More serving providers (4 vs 7)
- Has reasoning mode
Cheaper overall
Claude 4 Sonnet
$3.00 + $15.00 /1M
Larger context
Claude Opus 4.5
410K
More providers
Claude Opus 4.5
7 providers
Pricing & specs
cheapest listed route · per 1M tokensOn-demand listed rates, OpenRouter routed quotes and Vercel reseller quotes. Enterprise commitments can be materially lower.
| Claude 4 Sonnet | Claude Opus 4.5 | |
|---|---|---|
| Input $/1M | $3.00via Replicate best | $5.00via Anthropic |
| Output $/1M | $15.00via Replicate best | $25.00via Anthropic |
| Context window | 200K | 410K best |
| Max output | 200K best | 64K |
| Serving providers | 4 | 7 best |
| Date | First listed Jul 2025 | Released Nov 24, 2025 |
Benchmarks
Benchmark scores, side by side| Claude 4 Sonnet | Claude Opus 4.5 | |
|---|---|---|
| Intelligence | 16.6 | 23.7 best |
| Terminal-Bench | 36% | Not available |
| GPQA Diamond | 68% | 81% best |
| Output speed | Not available | 46 t/s |
| Latency (TTFT) | Not available | 1.09s |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Claude 4 Sonnet
via Replicate
$30
Claude Opus 4.5
via Gmi
$50
Capabilities
feature support, side by side| Feature | Claude 4 Sonnet | Claude Opus 4.5 |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | — | ✓ |
| Audio | — | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | — | — |
Related comparisons
Frequently asked questions
Which is cheaper, Claude 4 Sonnet or Claude Opus 4.5?
Claude 4 Sonnet is cheaper for input ($3.00 vs $5.00 per 1M tokens) from Replicate. Claude 4 Sonnet is cheaper for output ($15.00 vs $25.00 per 1M tokens) from Replicate.
What is the context window difference between Claude 4 Sonnet and Claude Opus 4.5?
Claude 4 Sonnet has a 200K-token context window and Claude Opus 4.5 has 410K tokens, so Claude Opus 4.5 can take a larger prompt.
How do Claude 4 Sonnet and Claude Opus 4.5 compare on benchmarks?
On the tracked benchmarks, Claude Opus 4.5 leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026
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