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OpenAI Releases GPT-6.1 Sol With Near-Astra Claims at One-Fifth the Token Price

September 29, 2026 at 13:45 EDT

Foundation Models
AI Agents
Software Dev & Coding

OpenAI released GPT-6.1 Sol on Tuesday, September 29, positioning the model as a more capable successor to GPT-6 Sol for agentic coding, computer use, document-heavy professional work and multi-step business workflows. The company says the new model approaches GPT-6 Astra on several professional tasks at one-fifth of Astra's standard input and output token prices.

September 29, 2026 | OpenAI

GPT-6.1 Sol moves near-Astra work down the cost curve

The new Sol model targets coding, document understanding, business workflows and computer use while pricing standard input and output at one-fifth of GPT-6 Astra.

The headline tradeoff

Astra remains the top tier, but GPT-6.1 Sol is priced as one-fifth of Astra's standard token cost.

1xGPT-6.1 Sol

5xGPT-6 Astra

Standard input and output token price ratio

$2input per 1M tokens

$0.10cached input per 1M

$10output per 1M tokens

1.05Mtoken context window

Improvement targets

Code writing and debugging

→

Complex PDF understanding

→

Multi-step workflows

→

Computer-use tasks

Why builders care

Cheaper cached input gives agents more room to reuse codebases, documents and long task history without reprocessing every token at the full rate.

What still limits it

The API model does not support the none or minimal reasoning-effort settings, so teams still need workload-specific cost and latency tests.

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