Claude 4 Opus vs GPT-5.5
API pricing, context window and capabilities for Claude 4 Opus 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 4 Opus wins on price. GPT-5.5 wins on intelligence and on context window. Benchmark data is unavailable for one or both models.
Price
Claude 4 Opus
Terminal-Bench
Not called
Intelligence
GPT-5.5
Context window
GPT-5.5
Key takeaways
who wins on what, from the published numbersClaude 4 Opus wins
- Cheaper output ($25.00 vs $30.00 /1M)
- Higher max output (200K vs 128K)
GPT-5.5 wins
- Larger context window (200K vs 1.1M)
- More serving providers (3 vs 6)
- Has web search
Cheaper overall
Claude 4 Opus
$5.00 + $25.00 /1M
Larger context
GPT-5.5
1.1M
More providers
GPT-5.5
6 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 Opus | GPT-5.5 | |
|---|---|---|
| Input $/1M | $5.00via Snowflake | $5.00via OpenAI |
| Output $/1M | $25.00via Snowflake best | $30.00via OpenAI |
| Context window | 200K | 1.1M best |
| Max output | 200K best | 128K |
| Serving providers | 3 | 6 best |
| Date | First listed Jul 2025 | Released Apr 23, 2026 |
Benchmarks
Benchmark scores, side by side| Claude 4 Opus | GPT-5.5 | |
|---|---|---|
| Intelligence | 16.6 | 38.4 best |
| Terminal-Bench | Not available | 84% |
| GPQA Diamond | 70% | 94% best |
| Output speed | Not available | 102 t/s |
| Latency (TTFT) | Not available | 70.60s |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Claude 4 Opus
via Snowflake
$50
GPT-5.5
via OpenAI
$55
Capabilities
feature support, side by side| Feature | Claude 4 Opus | GPT-5.5 |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
| Audio | — | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | — | ✓ |
Related comparisons
Frequently asked questions
Which is cheaper, Claude 4 Opus or GPT-5.5?
Claude 4 Opus is cheaper for output ($25.00 vs $30.00 per 1M tokens) from Snowflake.
What is the context window difference between Claude 4 Opus and GPT-5.5?
Claude 4 Opus has a 200K-token context window and GPT-5.5 has 1.1M tokens, so GPT-5.5 can take a larger prompt.
How do Claude 4 Opus and GPT-5.5 compare on benchmarks?
On the tracked benchmarks, GPT-5.5 leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026
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