LLM Comparison
Claude Opus 4.6 vs GPT-5.5 Pro
Side-by-side specs, pricing & capabilities · Updated April 2026
Price vs Intelligence
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2/6 models| Organization | ||
| OpenTools Score | 63 4.2 | 97 0.9 |
| Family | Claude | GPT |
| Status | Current | Current |
| Release Date | Feb 2026 | Apr 2026 |
| Context Window | 1.0M tokens | 1.1M tokens |
| Input Price | $5.00/M tokens | $30.00/M tokens |
| Output Price | $25.00/M tokens | $180.00/M tokens |
| Pricing Notes | Cache read: $0.5000/M tokens | No cached input discount. Long context (>272K tokens): 2x input, 1.5x output. Batch API: 50% discount. Regional processing: 10% uplift. |
| Capabilities | textvisioncodetool-use | textvisioncodetool-useextended-thinkingweb-search |
| Training Cutoff | — | December 2025 |
| Max Output | 128K tokens | 128K tokens |
| API Identifier | anthropic/claude-opus-4.6 | openai/gpt-5.5-pro |
| Benchmarks | ||
| MMLU | 89.8anthropic | — |
| GPQA Diamond | 91.3anthropic | — |
| SWE-bench Verified | 80.8anthropic | — |
| SWE-bench Pro | 53.4anthropic | — |
| Terminal-Bench 2.0 | 65.4anthropic | — |
| MATH 500 | 80.7anthropic | — |
| LiveCodeBench | 55.9anthropic | — |
| Berkeley Function Calling | 91.9anthropic | — |
| HLE | 48anthropic | — |
| MCP-Atlas | 75.8anthropic | — |
| BrowseComp | 83.7anthropic | 90.1openai |
| OSWorld-Verified | 72.7anthropic | — |
| DocVQA | 91.3anthropic | — |
| GPQA-AA Elo | 1619artificial-analysis | — |
| FrontierMath Tier 4 | — | 39.6openai |
| FrontierMath Tier 1-3 | — | 52.4openai |
| HLE (with tools) | — | 57.2openai |
| HLE (no tools) | — | 43.1openai |
| GeneBench | — | 33.2openai |
| GDPval | — | 82.3openai |
| Investment Banking Modeling | — | 88.6openai |
| View Claude Opus 4.6 | View GPT-5.5 Pro | |
Cost Calculator
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| Model | Input | Output | Total / mo | vs Best |
|---|---|---|---|---|
| Claude Opus 4.6Cheapest | $5.00 | $12.50 | $17.50 | — |
| GPT-5.5 Pro | $30.00 | $90.00 | $120.00 | +586% |
Anthropic
Claude Opus 4.6
Claude Opus 4.6 is a multimodal LLM from Anthropic with adaptive reasoning capabilities. Achieves 91.3% on GPQA Diamond and 80.8% on SWE-bench Verified. Supports up to 1,000,000 token context window. Available from $5.00/M input tokens.
OpenAI
GPT-5.5 Pro
GPT-5.5 Pro uses more compute to think harder and provide consistently better answers than GPT-5.5. Designed for the toughest problems, some requests may take several minutes. It excels at FrontierMath Tier 4 (39.6%) and BrowseComp (90.1%), offering the highest intelligence available from OpenAI at a premium price point.
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