“GPT-5.6 Sol is available at promotional pricing, 50% off standard rates, through September 3, 2026. The default tier is $2.00 per 1M input tokens, $0.20 per 1M cached input tokens, $2.50 per 1M cache write tokens, and $10.00 per 1M output tokens. The long context tier is $4.00 per 1M input tokens, $0.40 per 1M cached input tokens, $5.00 per 1M cache write tokens, and $15.00 per 1M output tokens.”