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Observed 2026-06-03 11:12. Prices are USD per 1M tokens (from OpenRouter public pricing). Input: GPT-5 Pro $15 / Gemini 3.1 Pro $2, output: $120 / $12.
✓ = the mechanically better side per row (cheaper price / longer context). Magnitude only, not a rating.
| Field | GPT-5 Pro openai/gpt-5-pro | Gemini 3.1 Pro google/gemini-3.1-pro-preview |
|---|---|---|
| Input priceUSD/1M | $15 | $2✓ |
| Output priceUSD/1M | $120 | $12✓ |
| Cache readUSD/1M | Accumulating… | $0.2 |
| Context windowtokens | 400k | 1,048.576k✓ |
Source: OpenRouter /api/v1/models → collect_prices.py → Source(price)。 · GPT-5 Pro: openai/gpt-5-pro · Gemini 3.1 Pro: google/gemini-3.1-pro-preview
Aggregated observations, not predictions. Prices change (observation time noted). © TraceBottle for AI
As observed on 2026-06-03 11:12, input is GPT-5 Pro $15 / Gemini 3.1 Pro $2 per 1M tokens — Gemini 3.1 Pro is cheaper. Output is $120 / $12 — Gemini 3.1 Pro is cheaper.
GPT-5 Pro: 400,000 tokens, Gemini 3.1 Pro: 1,048,576 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.