GPT-6 Sol

Name: GPT-6 Sol
Price: 2 USD
Author: OpenAI

OpenAI🇺🇸 United States

active

Compare with other models →

Context window1050K tokens

Input / 1M tokens$2

Output / 1M tokens$10

Version History

GPT-6majorSeptember 22, 2026

GPT-6 Sol and Luna succeed the GPT-5.6 generation, offering half the API cost and a claimed 50% reduction in factual errors, with Sol reportedly reaching Astra-level reliability at lower cost.

Benchmark Scores

Full leaderboard →

6.5%

Hallucination (Summarization)

129.0 tokens_per_sec

Speed (tok/s)

Coverage

model releaseOpenAI

OpenAI Releases GPT-6 Sol and Luna at Half the Price of Predecessors

OpenAI has released GPT-6 Sol and Luna, updated versions of its mid-tier and lightweight models, priced at half the cost of their GPT-5.6 predecessors. The company claims GPT-6 Sol makes roughly half as many factual errors as its predecessor, reaching what it calls 'Astra-level reliability' at lower cost.

September 22, 2026 · 6:06 PM3 min read

OpenAI GPT-6 GPT-6 Sol