OpenAI has priced GPT-5.6 Sol
OpenAI has priced GPT-5.6 Sol, its flagship model, much closer to Claude Opus 4.8 than to Anthropic’s premium Mythos 5, signaling that it’s competing on both performance and cost.
API pricing (per 1M tokens):
• GPT-5.6 Sol: $5 input / $30 output
• Claude Opus 4.8: $5 / $25
• Claude Mythos 5: $10 / $50
• GPT-5.6 Terra: $2.50 / $15
• GPT-5.6 Luna: $1 / $6
OpenAI is also positioning its lineup aggressively:
Terra is described as delivering performance comparable to GPT-5.5 while costing 50% less. Luna is aimed at developers who need strong capabilities at the lowest price point.
The company is pairing lower prices with faster inference. OpenAI announced that GPT-5.6 Sol will run on Cerebras hardware, delivering speeds of up to 750 tokens per second starting in July, one of the fastest frontier-model deployments announced so far.

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