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 listed serving route per 1M tokens, from LiteLLM and OpenRouter.
Verdict
computed from the published numbersClaude Opus 4.8 wins on price, on Terminal-Bench and on intelligence. GPT-5.5 wins on context window.
Price
Claude Opus 4.8
Terminal-Bench
Claude Opus 4.8
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 (8 vs 6)
GPT-5.5 wins
- Larger context window (1M vs 1.1M)
Cheaper overall
Claude Opus 4.8
$5.00 + $25.00 /1M
Larger context
GPT-5.5
1.1M
More providers
Claude Opus 4.8
8 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 Opus 4.8 | GPT-5.5 | |
|---|---|---|
| Input $/1M | $5.00via Anthropic | $5.00via OpenAI |
| Output $/1M | $25.00via Anthropic best | $30.00via OpenAI |
| Context window | 1M | 1.1M best |
| Max output | 128K | 128K |
| Serving providers | 8 best | 6 |
| Date | Released May 28, 2026 | Released Apr 23, 2026 |
Benchmarks
Benchmark scores, side by side| Claude Opus 4.8 | GPT-5.5 | |
|---|---|---|
| Intelligence | 41.8 best | 38.4 |
| Terminal-Bench | 85% best | 84% |
| GPQA Diamond | 92% | 94% best |
| Output speed | 62 t/s | 102 t/s best |
| Latency (TTFT) | 56.16s best | 70.60s |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Claude Opus 4.8
via Azure
$50
GPT-5.5
via OpenAI
$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) from Anthropic.
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 benchmarks, Claude Opus 4.8 leads on Terminal-Bench, and Claude Opus 4.8 leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026
Every weekday
AI moves fast. Here's your debrief.
News, analysis, tools, and more.
For people who build with AI