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Side-by-side
GPT-5 vs Claude Sonnet 4.6
OpenAI vs Anthropic — head-to-head specs and pricing.
OpenAI
GPT-5
OpenAI's flagship general-purpose model.
GPT-5 is OpenAI's flagship LLM — strong reasoning, tool use, vision, and JSON mode. Drop-in for anything you'd use GPT-4o for.
Anthropic
Claude Sonnet 4.6
Balanced speed + capability.
Sonnet is Anthropic's balanced model for general agents and chat.
| Spec | GPT-5 | Claude Sonnet 4.6 |
|---|---|---|
| Provider | OpenAI | Anthropic |
| Input cost / 1M tokens | $3.00 | $3.60 |
| Output cost / 1M tokens | $12.00 | $18.00 |
| Context window | 256,000 tokens | 200,000 tokens |
| Max output tokens | 16,000 | 16,000 |
| Streaming support | ✓ | ✓ |
| Tool calling | ✓ | ✓ |
| Vision input | ✓ | ✓ |
| JSON mode | ✓ | — |
| Status | ACTIVE | ACTIVE |
Use both via OneAPIKey — one key, one bill
OneAPIKey aggregates OpenAI, Anthropic, and 10 more providers behind a single API. Smart Routing automatically picks the best model per request — or you choose explicitly.
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