Claude Sonnet 5 vs GPT-5.5
Side-by-side comparison of API pricing, specs, benchmarks, and capabilities
|
by Anthropic
|
by OpenAI
|
|
|---|---|---|
| Overview | ||
| Status | Current mid tier | Current flagship |
| Released | Jun 30, 2026 | Nov 15, 2025 |
| Pricing per million tokens | ||
| Input | $2.00/Mtok | $5.00/Mtok |
| Output | $10.00/Mtok | $30.00/Mtok |
| Blended avg | $6.00/Mtok | $17.50/Mtok |
| Cached input | $0.200/Mtok | $0.500/Mtok |
| Specifications | ||
| Context window | 1M tokens | 270K tokens |
| Parameters | Proprietary | Proprietary |
| Speed (TPS) | — | — |
| Modalities | ||
| Input |
textimage
|
textimageaudio
|
| Benchmarks from Vellum LLM Leaderboard | ||
| Avg benchmark score | 64 | |
| Perf / dollar | 3.7 | |
| Providers | ||
| Available from |
Anthropic — $2.00/$10.00/Mtok
|
OpenAI — $5.00/$30.00/Mtok
|
Cost at scale — 1M tokens (50/50 input/output)
| Volume | Claude Sonnet 5 | GPT-5.5 | Savings |
|---|---|---|---|
| 1M tokens | $6 | $17.5 | $11.5 (65.7%) |
| 10M tokens | $60 | $175 | $115 (65.7%) |
| 100M tokens | $600 | $1750 | $1150 (65.7%) |
| 1000M tokens | $6000 | $17500 | $11500 (65.7%) |
Summary
Claude Sonnet 5 by Anthropic costs $2.00/Mtok input and $10.00/Mtok output, with a 1M-token context window. It supports text, image input.
GPT-5.5 by OpenAI costs $5.00/Mtok input and $30.00/Mtok output, with a 270K-token context window. It supports text, image, audio input.
On a blended cost basis, Claude Sonnet 5 is 191.7% cheaper than GPT-5.5. It also has a larger context window.
On benchmarks, GPT-5.5 scores higher (64 vs ) on average. In terms of value, GPT-5.5 has better performance per dollar (3.7 vs ).
Note: Pricing is per million tokens. Actual costs vary with usage patterns, prompt caching, and batch discounts. Always verify against official provider pricing pages.