Head-to-Head Model Showdown
Gemini 3.1 Pro vs GPT-6 Astra
Gemini 3.1 Pro vs GPT-6 Astra side by side: arena.ai text score, list price per 1M tokens, context window and licence, with sources. Data checked 2026-10-11.
Executive Verdict
On the arena.ai text leaderboard, Gemini 3.1 Pro scores 1487 (±3, #17) and GPT-6 Astra scores 1475 (±7, #35). Gemini 3.1 Pro leads by 12 points, outside the margin of error. Gemini 3.1 Pro: $2.00 input / $12.00 output per 1M tokens. GPT-6 Astra: $10.00 / $50.00. Blended at 3 input : 1 output, Gemini 3.1 Pro costs 78% less ($4.50 vs $20.00 per 1M tokens). Context windows are about the same: Gemini 3.1 Pro 1M tokens, GPT-6 Astra 1.05M tokens. Both are proprietary and available only as hosted APIs.