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Observed 2026-06-03 11:12. Prices are USD per 1M tokens (from OpenRouter public pricing). Input: Claude Sonnet 4 $3 / GPT-5.5 Pro $30, output: $15 / $180.
✓ = the mechanically better side per row (cheaper price / longer context). Magnitude only, not a rating.
| Field | Claude Sonnet 4 anthropic/claude-sonnet-4 | GPT-5.5 Pro openai/gpt-5.5-pro |
|---|---|---|
| Input priceUSD/1M | $3✓ | $30 |
| Output priceUSD/1M | $15✓ | $180 |
| Cache readUSD/1M | $0.3 | Accumulating… |
| Context windowtokens | 1,000k | 1,050k✓ |
Source: OpenRouter /api/v1/models → collect_prices.py → Source(price)。 · Claude Sonnet 4: anthropic/claude-sonnet-4 · GPT-5.5 Pro: openai/gpt-5.5-pro
Aggregated observations, not predictions. Prices change (observation time noted). © TraceBottle for AI
As observed on 2026-06-03 11:12, input is Claude Sonnet 4 $3 / GPT-5.5 Pro $30 per 1M tokens — Claude Sonnet 4 is cheaper. Output is $15 / $180 — Claude Sonnet 4 is cheaper.
Claude Sonnet 4: 1,000,000 tokens, GPT-5.5 Pro: 1,050,000 tokens (observed 2026-06-03 11:12).
Observed 2026-06-03 11:12 (UTC). Source: OpenRouter public pricing (/api/v1/models). Prices change — check each provider's official pricing for the latest. This site publishes only observed values, never predictions.