How much does GPT-5.6 Sol cost?

GPT-5.6 Sol is billed per token: $4 per million input tokens and $20 per million output tokens. Cached input reads cost $0.4 per million tokens.

What is the GPT-5.6 Sol context window?

GPT-5.6 Sol accepts up to 1,048,576 tokens of context and can return up to 128,000 output tokens per request.

Is GPT-5.6 Sol cheaper than other OpenAI models?

No — 5 of the 8 OpenAI models we track have a lower input price, starting with GPT-5 mini at $0.25/M, GPT-5.6 Luna at $0.2/M, GPT-5.6 Terra at $2/M.

Has GPT-5.6 Sol pricing changed recently?

Yes. The most recent tracked change was on August 31, 2026 (Decrease).

GPT-5.6 Sol Pricing

Name: GPT-5.6 Sol
Brand: OpenAI
Price: 4 USD

OpenAI · GPT-5.6 · Live

Prices verified September 14, 2026

GPT-5.6 Sol costs $4 per million input tokens and $20 per million output tokens on the OpenAI API. Cached input reads are billed at $0.4 per million tokens. It supports a 1,048,576-token context window and up to 128,000 output tokens per request. The model supports extended reasoning, image input, tool use, long context. Released July 9, 2026. Pricing verified September 14, 2026.

GPT-5.6 Sol API pricing

GPT-5.6 Sol API pricing is $4 per million input tokens and $20 per million output tokens, verified September 14, 2026.

Input (per 1M tokens): $4
Output (per 1M tokens): $20
Cached input (per 1M tokens): $0.4
Batch discount: 50%
Context window: 1,048,576 tokens
Max output: 128,000 tokens
Released: July 9, 2026

Estimate your GPT-5.6 Sol cost

Capabilities

GPT-5.6 Sol supports extended reasoning, image input, tool use, long context.

Extended reasoningImage inputTool useLong context

Price history

See full GPT-5.6 Sol price history

GPT-5.6 Sol API pricing has changed 2 times on record, most recently on August 31, 2026 (decrease).

August 31, 2026: Decrease — input $4/M — output $20/M
August 21, 2026: Decrease — input $5 → $4/M (−$1) — output $30 → $20/M (−$10)

Frequently asked questions

Short answers to the most common questions about GPT-5.6 Sol pricing, limits, and capabilities.

Notes

PROMOTIONAL PRICE CUT 2026-08-21: OpenAI cut Sol input $5 -> $4, output $30 -> $20 (>20% cut). Announced as promotional, valid through at least 2026-11-21, applied to pay-as-you-go API + Codex credits + eligible ChatGPT Work plans. Pro/Plus/Business subs unchanged. Result: Sol now costs LESS than Claude Opus 5 on both input and output, first time in the lineup's history. This is a defensive move against DeepSeek V4-Pro and Anthropic's Sonnet 5 hold at $2/$10. Confirmed via multiple 2026-08-21+ sources including Enterprise DNA, Technology.org, DigitalApplied. [2026-08-31] Cache Read fell $0.50 -> $0.40 per MTok. The 2026-08-21 cut also moved cached input in step with the 20% input reduction (cache reads bill at 1/10th of the $4 input rate). Corroborated by cellcog.ai/blog/gpt-5-6-pricing, orcarouter.ai/blog/gpt-5-6-sol-pricing and openrouter.ai/openai/gpt-5.6-sol. Standard input $4 / output $20 re-verified unchanged.