Claude Sonnet 5 vs GPT-5.5
API pricing, context window and capabilities for Claude Sonnet 5 and GPT-5.5, side by side. Prices are the cheapest serving route per 1M tokens, verified against LiteLLM and OpenRouter.
Verdict
computed from the published numbersClaude Sonnet 5 wins on price. GPT-5.5 wins on coding, on intelligence and on context window.
Price
Claude Sonnet 5
Coding
GPT-5.5
Intelligence
GPT-5.5
Context window
GPT-5.5
Key takeaways
who wins on what, from the published numbersClaude Sonnet 5 wins
- Cheaper input ($2.00 vs $5.00 /1M)
- Cheaper output ($10.00 vs $30.00 /1M)
- More serving providers (4 vs 2)
GPT-5.5 wins
- Larger context window (1M vs 1.1M)
- Has web search
Cheaper overall
Claude Sonnet 5
$2.00 + $10.00 /1M
Larger context
GPT-5.5
1.1M
More providers
Claude Sonnet 5
4 providers
Pricing & specs
cheapest serving route · per 1M tokens| Claude Sonnet 5 | GPT-5.5 | |
|---|---|---|
| Input $/1M | $2.00 best | $5.00 |
| Output $/1M | $10.00 best | $30.00 |
| Context window | 1M | 1.1M best |
| Max output | 128K | 128K |
| Serving providers | 4 best | 2 |
| Released | 2026-06-30 | 2026-04-23 |
Benchmarks
Artificial Analysis indices, side by side| Claude Sonnet 5 | GPT-5.5 | |
|---|---|---|
| Intelligence | 53.4 | 54.8 best |
| Coding | 71.5 | 74.9 best |
| GPQA Diamond | 91% | 94% best |
| Output speed | 67 t/s | 87 t/s best |
| Latency (TTFT) | 42.19s | 23.21s best |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Claude Sonnet 5
via Amazon Bedrock
$20
GPT-5.5
via Azure
$55
Capabilities
feature support, side by side| Feature | Claude Sonnet 5 | GPT-5.5 |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
| Audio | — | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | — | ✓ |
Related comparisons
Frequently asked questions
Which is cheaper, Claude Sonnet 5 or GPT-5.5?
Claude Sonnet 5 is cheaper for input ($2.00 vs $5.00 per 1M tokens). Claude Sonnet 5 is cheaper for output ($10.00 vs $30.00 per 1M tokens).
What is the context window difference between Claude Sonnet 5 and GPT-5.5?
Claude Sonnet 5 has a 1M-token context window and GPT-5.5 has 1.1M tokens, so GPT-5.5 can take a larger prompt.
How do Claude Sonnet 5 and GPT-5.5 compare on benchmarks?
On the tracked Artificial Analysis indices, GPT-5.5 leads on coding, and GPT-5.5 leads on intelligence.
Pricing verified against LiteLLM + OpenRouter + provider pages · refreshed daily
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