Claude Opus 4.8 vs GPT-5.5
API pricing, context window and capabilities for Claude Opus 4.8 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 Opus 4.8 wins on price and on intelligence. GPT-5.5 wins on coding and on context window.
Price
Claude Opus 4.8
Coding
GPT-5.5
Intelligence
Claude Opus 4.8
Context window
GPT-5.5
Key takeaways
who wins on what, from the published numbersClaude Opus 4.8 wins
- Cheaper output ($25.00 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 Opus 4.8
$5.00 + $25.00 /1M
Larger context
GPT-5.5
1.1M
More providers
Claude Opus 4.8
4 providers
Pricing & specs
cheapest serving route · per 1M tokens| Claude Opus 4.8 | GPT-5.5 | |
|---|---|---|
| Input $/1M | $5.00 | $5.00 |
| Output $/1M | $25.00 best | $30.00 |
| Context window | 1M | 1.1M best |
| Max output | 128K | 128K |
| Serving providers | 4 best | 2 |
| Released | 2026-05-28 | 2026-04-23 |
Benchmarks
Artificial Analysis indices, side by side| Claude Opus 4.8 | GPT-5.5 | |
|---|---|---|
| Intelligence | 55.7 best | 54.8 |
| Coding | 74.3 | 74.9 best |
| GPQA Diamond | 92% | 94% best |
| Output speed | 68 t/s | 87 t/s best |
| Latency (TTFT) | 38.57s | 23.21s best |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Claude Opus 4.8
via Amazon Bedrock
$50
GPT-5.5
via Azure
$55
Capabilities
feature support, side by side| Feature | Claude Opus 4.8 | GPT-5.5 |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
| Audio | — | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | — | ✓ |
Related comparisons
Frequently asked questions
Which is cheaper, Claude Opus 4.8 or GPT-5.5?
Claude Opus 4.8 is cheaper for output ($25.00 vs $30.00 per 1M tokens).
What is the context window difference between Claude Opus 4.8 and GPT-5.5?
Claude Opus 4.8 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 Opus 4.8 and GPT-5.5 compare on benchmarks?
On the tracked Artificial Analysis indices, GPT-5.5 leads on coding, and Claude Opus 4.8 leads on intelligence.
Pricing verified against LiteLLM + OpenRouter + provider pages · refreshed daily
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