GPT-6 Sol API Pricing
GPT-6 Sol launched September 22, 2026 as OpenAI's coding and agentic workhorse, and a week later OpenAI replaced it in its lineup with GPT-6.1 Sol, which keeps the same input and output rates and halves the cache read. GPT-6 Sol stays on the price list at $2.00/M input, $0.20/M cached input and $10.00/M output - half the card of the GPT-5.6 Sol it followed. Prompts over 272K input tokens move to the long-context card, where input doubles to $4/M but output rises only to $15/M.
Run the numbers.
Live calculator pre-loaded with GPT-6 Sol's standard short-context rates. Reasoning effort runs from none to max and reasoning tokens bill as output, so put them in the reasoning field. Cross 272K input tokens in one prompt and the long-context card applies instead.
Real-world presets.
Repo-wide architecture migration
Multi-step diligence brief
Reading 150-page contracts
Executive workflow turn
Counted with the o200k_base BPE encoding — the same tokenizer the API uses — entirely in your browser. The encoder loads on your first keystroke (~1 MB, one time); your text never leaves this page.
| Model | Input /M | Output /M | Effective blended | Context | Best for |
|---|---|---|---|---|---|
| GPT-6 Sol Current | $2.00 cache $0.20 | $10.00 | $1.36 agentic 92/8 | 1.05M | Coding and long-running agents |
| GPT-6.1 Sol | $2.00 cache $0.10 | $10.00 | $1.29 −6% | 1.05M | The Sol OpenAI now lists, cheaper cache |
| GPT-6 Luna | $0.10 cache $0.01 | $0.50 | $0.0682 −20× | 1.05M | High-volume routing tier |
| GPT-6 Astra | $10.00 cache $1.00 | $50.00 | $6.82 +5.0× | 1.05M | OpenAI's top-of-stack reasoning tier |
| GPT-5.6 Sol | $4.00 cache $0.40 | $20.00 | $2.73 +2.0× · promo | 1.05M | The Daybreak-programme Sol, still listed |
| GPT-5.6 Terra | $2.00 cache $0.20 | $12.00 | $1.52 +12% | 1.05M | Balanced GPT-5.6 agents |
| Claude Opus 5.5 | $4.00 cache $0.20 | $20.00 | $2.58 +89% | 1M | Anthropic's frontier alternative |
| Grok 4.7 | $2.00 cache $0.50 | $6.00 | $1.19 −13% | 500K | Cheaper frontier coding model |
Compare siblings
Frequently asked.
GPT-6 Sol pricing questions - the standard card, the long-context step, and how it lands against the Sols either side of it.
Q · 01 How much does GPT-6 Sol cost? +
gpt-6-sol at $2.00/M input, $0.20/M cached input, $2.50/M cache writes and $10.00/M output for prompts up to 272K input tokens.Q · 02 Is it cheaper than GPT-5.6 Sol? +
$2.00 / $10.00 against $4.00 / $20.00. Under our standard blend (92% input, 82% cache hits) that is $1.36/M against $2.73/M. GPT-5.6 Sol's rate is itself promotional and OpenAI commits to it only through November 21, 2026.Q · 03 Should I use GPT-6 Sol or GPT-6.1 Sol? +
$2.00 / $10.00 card with the cache read at $0.10/M instead of $0.20/M, so the blend drops to $1.29/M from $1.36/M, and it is the Sol OpenAI now lists. GPT-6 Sol keeps two things 6.1 Sol lacks: the none reasoning effort, and function calling in Chat Completions with reasoning off. It is not deprecated.Q · 04 When does long-context pricing apply? +
272K input tokens. The whole request then bills at $4/M input, $0.40/M cached input and $15/M output. Note the asymmetry: input doubles, output rises by half.Q · 05 How much cheaper are Batch and Flex? +
$1/M input and $5/M output. Fast mode - the tier OpenAI renamed from Priority on July 30, 2026 - runs the other way at double standard, $4/M and $20/M.Q · 06 What is the context window? +
1.05M tokens, with 128K max output and a knowledge cutoff of April 20, 2026. It takes text and image input and returns text, on both the Responses and Chat Completions APIs.