LLM API pricing / OpenAI

What the OpenAI API costs, model by model

OpenAI sells 11 current models with a verified price on its API, from $0.10 to $12.50 per 1M input tokens and from $0.50 to $75.00 per 1M output tokens. Every price below was read on a page OpenAI publishes, verified between September 28, 2026 and September 30, 2026, and links to it.

Current models

How OpenAI prices its models

• 11 of the 11 models publish a cached-input price, at 5% or 10% of the input price.
• 7 models charge more for long prompts (prompts over 272,000 tokens): GPT-6 Luna $0.20 / $0.75, GPT-5.6 Luna $0.40 / $1.80, GPT-5.6 Terra $4.00 / $18.00, GPT-6 Sol $4.00 / $15.00, GPT-6.1 Sol $4.00 / $15.00, GPT-5.6 Sol $8.00 / $30.00, GPT-6 Astra $20.00 / $75.00.
• 1 price is promotional: GPT-5.6 Sol at least through November 21, 2026, no list price published for after.

Second price lists

Prices OpenAI prints for other ways of buying the same tokens, per 1M tokens, only where its page prints a figure for the model.

Batch · half of Standard on every column

• GPT-6 Luna: $0.05 input, $0.005 cached input, $0.0625 cache write, $0.25 output (read September 24, 2026)
• GPT-6.1 Sol: $1.00 input, $0.05 cached input, $1.25 cache write, $5.00 output (read September 30, 2026)
• GPT-5.6 Sol: $2.00 input, $0.20 cached input, $2.50 cache write, $10.00 output (read September 16, 2026)
• GPT-6 Astra: $5.00 input, $0.50 cached input, $6.25 cache write, $25.00 output (read September 16, 2026)

OpenAI: "Learn how to use OpenAI's Batch API to send asynchronous groups of requests with 50% lower costs, a separate pool of significantly higher rate limits, and a clear 24-hour turnaround time." source

Flex · half of Standard on every column, the same figures as Batch

• GPT-6 Luna: $0.05 input, $0.005 cached input, $0.0625 cache write, $0.25 output (read September 24, 2026)
• GPT-6.1 Sol: $1.00 input, $0.05 cached input, $1.25 cache write, $5.00 output (read September 30, 2026)
• GPT-5.6 Sol: $2.00 input, $0.20 cached input, $2.50 cache write, $10.00 output (read September 16, 2026)
• GPT-6 Astra: $5.00 input, $0.50 cached input, $6.25 cache write, $25.00 output (read September 16, 2026)

OpenAI: "Flex processing provides lower costs for Responses or Chat Completions requests in exchange for slower response times and occasional resource unavailability." source

Fast mode · double Standard on every column

• GPT-6 Luna: $0.20 input, $0.02 cached input, $0.25 cache write, $1.00 output (read September 24, 2026)
• GPT-6.1 Sol: $4.00 input, $0.20 cached input, $5.00 cache write, $20.00 output (read September 30, 2026)
• GPT-5.6 Sol: $8.00 input, $0.80 cached input, $10.00 cache write, $40.00 output (read September 16, 2026)
• GPT-6 Astra: $20.00 input, $2.00 cached input, $25.00 cache write, $100.00 output (read September 16, 2026)

OpenAI: "Priority processing was renamed Fast mode on July 30, 2026." source

Ultrafast · the figures printed on the pricing page's Ultrafast tab

• GPT-6 Astra: $60.00 input, $6.00 cached input, $75.00 cache write, $300.00 output (read September 30, 2026)

OpenAI: "Ultrafast mode is the fastest service tier in the OpenAI API. It is broadly available for GPT-6 Astra, with preview access for GPT-5.6 Sol. Use it when speed justifies the higher cost." source

Retirements

Deprecated, still callable: GPT-3.5 Turbo (shutdown October 23, 2026); GPT-4 (shutdown October 23, 2026); GPT-4 Turbo (shutdown October 23, 2026); o1 (shutdown October 23, 2026); o1-pro (shutdown October 23, 2026); o3-mini (shutdown October 23, 2026); GPT-5 (shutdown December 11, 2026); GPT-5 mini (shutdown December 11, 2026); o3 (shutdown December 11, 2026).

• October 23, 2026 (announced): Shutdown of o1, o1-pro, o3-mini, GPT-4, GPT-4 Turbo and GPT-3.5 Turbo source
• December 11, 2026 (announced): Shutdown of GPT-5, GPT-5 mini and o3 source

Recorded price changes

• September 16, 2026 · added to this dataset, our omission: GPT-6 Astra, GPT-Rosalind. Full explanation
• September 10, 2026 · correction of this site's reading · figure shown here up 2.0×. Correction of our own reading, not a price change by OpenAI. From September 3 to September 10, 2026 this site published GPT-5.6 Sol at $2 / $10, Terra at $1 / $6 and Luna at $0.10 / $0.60 per million tokens, read from the Batch tab of OpenAI's pricing page, which is always 50% of Standard (the page's four tabs, Standard, Batch, Flex and Fast mode, look identical in plain text), and labelled as a promotion ending November 21 with double the price after it. The Standard short-context prices, verified by hand on September 10, are Sol $4 / $20, Terra $2 / $12 and Luna $0.20 / $1.20, and the published figures doubled to them. The November 21 date was OpenAI's, but it belongs to Sol alone and is not an end date: OpenAI states that Sol's $4 / $20 is promotional pricing, a 20% reduction on input and 33% on output, available at least through November 21, 2026, and publishes no list price for after it; Terra and Luna carry no promotion. On September 10 this entry wrongly said there was no promotion to end; corrected on September 15, when the Sol row got its promotion back, marked as at least through that date, without an invented list price. source

Analysis that cites OpenAI models

• Prompt Caching Is Not 10% Everywhere: What a Cache Hit Costs Across Eight Providers · names 8 OpenAI models
• Same List Price, Different Bill: Five Pairs of LLM APIs Where the Workload Decides What You Pay · names 3 OpenAI models
• OpenAI's Pricing Page Has Four Tabs That Look the Same in Plain Text. We Published the Wrong One for Seven Days. · names 3 OpenAI models
• The Second Price List: What Batch, Flex, Priority and Data-Sharing Discounts Cost Across Seven Providers · names 2 OpenAI models
• Five Things Decide What You Pay for a Model, and Only One of Them Is the Model · names 1 OpenAI model

How every figure is checked: methodology. All providers: the full pricing table.