GPT-5.5 vs Claude Sonnet 4.6
OpenAI's flagship vs Anthropic's mid-tier — Sonnet 4.6 is 40-50% cheaper with nearly identical 1M context windows. The smart money pick for production workloads.
Pricing data verified: Jun 8, 2026
| Specification | GPT-5.5 | Claude Sonnet 4.6 |
|---|---|---|
| Input Price (per 1M tokens) | $5.00 | $3.00 |
| Output Price (per 1M tokens) | $30.00 | $15.00 |
| Context Window | 1.05M tokens | 1M tokens |
| Tier | Premium | Mid |
| Provider | OpenAI | Anthropic |
| Output Savings | — | 50% cheaper |
| Cost at 1M input + 500K output | $20.00 | $10.50 |
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Which Model for Which Use Case?
Cost Optimization
Sonnet 4.6 delivers 40-50% cost savings with quality that handles most production workloads. The premium price of GPT-5.5 is only justified for the most demanding reasoning tasks.
Production Workloads
For chatbots, RAG pipelines, content generation, and code assistance, Sonnet 4.6's quality is more than sufficient at nearly half the cost. Both have 1M context windows.
Complex Reasoning & Research
GPT-5.5 is OpenAI's most capable model — state-of-the-art at multi-step reasoning, complex analysis, and cutting-edge tasks where quality is paramount.
Long Context Processing
Both models offer ~1M token context windows (GPT-5.5: 1.05M, Sonnet 4.6: 1M). For long document analysis, either works — Sonnet at 40-50% lower cost.
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Frequently Asked Questions
Is Claude Sonnet 4.6 cheaper than GPT-5.5?
Yes. Claude Sonnet 4.6 costs $3/M input and $15/M output. GPT-5.5 costs $5/M input and $30/M output. Sonnet 4.6 is 40% cheaper on input and 50% cheaper on output. For a typical workload of 1M input + 500K output tokens/month, Sonnet 4.6 costs $10.50 vs GPT-5.5's $20.00 — saving you $9.50/month (48%).
How does Claude Sonnet 4.6 quality compare to GPT-5.5?
GPT-5.5 is OpenAI's most capable model with state-of-the-art reasoning and coding. Claude Sonnet 4.6 is Anthropic's mid-tier model, offering excellent quality at a lower price point. Both have ~1M token context windows. GPT-5.5 is better for complex multi-step reasoning, while Sonnet 4.6 offers better value for most production workloads.
When should I choose GPT-5.5 over Claude Sonnet 4.6?
Choose GPT-5.5 when you need: (1) absolute best reasoning quality regardless of cost, (2) complex multi-step analysis, (3) cutting-edge capabilities. Choose Sonnet 4.6 when you want excellent quality at 40-50% lower cost — it handles most production workloads well and its 1M context window matches GPT-5.5's.
What is the context window difference between GPT-5.5 and Claude Sonnet 4.6?
Both models offer ~1M token context windows — GPT-5.5 at 1.05M and Sonnet 4.6 at 1M. They're essentially equivalent for context capacity, making Sonnet 4.6's 40-50% price advantage even more compelling.