OpenAI API Pricing
We track 12 OpenAI models, 11 of them open to new users. The cheapest of those is GPT-6 Luna at $0.10/MTok input and $0.50/MTok output, and the most expensive is GPT-5.5 Pro at $30.00/MTok input and $180.00/MTok output.
Prices checked 13 Nov 2026 against OpenAI’s pricing page ↗
Subscriptions. Looking for ChatGPT Go, Plus, Pro or Business? See ChatGPT plans → · Using Codex? See Codex pricing →
| Model | Input | Output | Cached in |
|---|---|---|---|
| GPT-6 LunaBudget | $0.10 | $0.50 | $0.010 |
| GPT-6.1 SolMid-tier | $2.00 | $10.00 | $0.10 |
| GPT-6 AstraFlagship | $10.00 | $50.00 | $1.00 |
Per 1M tokens · 11 current models + 1 legacy · Largest context 1.05M tokens · Batch discount 50% off on 11 of 11 current models
Model prices
| Model | Tier | Input | Output | Over size | Cached in | Batch in / out | Context | Details |
|---|---|---|---|---|---|---|---|---|
| GPT-6 Astra | Flagship | $10.00 | $50.00 | over 272K: $20.00 / $75.00 | $1.00 | $5.00 / $25.00 | 1.05M | Details for GPT-6 Astra |
OpenAI's most capable model (Sep 3, 2026). Cached read $1.00, cache write $12.50 (1.25x input). $20/$75 above 272K. Fast mode bills 2x, and the Ultrafast tier (late Sep 2026) bills 6x ($60/$300). 128K max output. No 'none' reasoning effort or custom temperature/top_p, and tool calling requires the Responses API. | ||||||||
| GPT-6.1 Sol | Mid-tier | $2.00 | $10.00 | over 272K: $4.00 / $15.00 | $0.10 | $1.00 / $5.00 | 1.05M | Details for GPT-6.1 Sol |
Mid tier (Sep 29, 2026), which OpenAI pitches as near-Astra performance at a fifth of the price. Replaced GPT-6 Sol (Sep 22, also $2/$10) a week after launch. Cached input $0.10, 5% of input where most OpenAI models charge 10%. Cache write $2.50. $4/$15 above 272K. 128K max output. | ||||||||
| GPT-6 Luna | Budget | $0.10 | $0.50 | over 272K: $0.20 / $0.75 | $0.010 | $0.050 / $0.25 | 1.05M | Details for GPT-6 Luna |
Budget tier (Sep 22, 2026) and OpenAI's cheapest current-generation model, half the price of GPT-5.6 Luna on input. OpenAI's named replacement for GPT-5.4 Nano. Cached input $0.01, cache write $0.125. $0.20/$0.75 above 272K. 128K max output. Claude Haiku 5.5 (Oct 7) matches $0.10/$0.50, but only on prompts up to 100K tokens. | ||||||||
| GPT-6.1 Terra | Mid-tier | $1.00 | $5.00 | over 272K: $2.00 / $7.50 | $0.050 | $0.50 / $2.50 | 1.05M | Details for GPT-6.1 Terra |
Newest Terra model (Oct 26, 2026), which OpenAI pitches for visual reasoning, computer use and writing. Cached input $0.05 (5% of input), cache write $1.25. $2/$7.50 above 272K. 128K max output. Tool calling requires the Responses API. | ||||||||
| GPT-5.6 Sol | Flagship | $4.00 until 30 Nov 2026; $5.00 from 1 Dec 2026 | $20.00 until 30 Nov 2026; $30.00 from 1 Dec 2026 | over 272K: $8.00 / $30.00 | $0.40 | $2.00 / $10.00 | 1.05M | Details for GPT-5.6 Sol |
GA Jul 9, 2026. GPT-6.1 Sol ($2/$10) now sits between it and GPT-6 Astra at half its promotional price. Promotional $4/$20 since Aug 21, 2026 (list $5/$30), which OpenAI says runs until Nov 30, 2026. Cached read $0.40, cache write $5.00 (1.25x input). 2x in/1.5x out above 272K. | ||||||||
| GPT-5.6 Terra | Mid-tier | $2.00 | $12.00 | over 272K: $4.00 / $18.00 | $0.20 | $1.00 / $6.00 | 1.05M | Details for GPT-5.6 Terra |
Previous mid tier (GA Jul 9, 2026). Cut 20% from $2.50/$15.00 on Jul 30, 2026. GPT-6.1 Sol now matches its input price and undercuts it on output ($10 vs $12). Cached read $0.20, cache write $2.50 (1.25x input). 2x in/1.5x out above 272K. | ||||||||
| GPT-5.6 Luna | Budget | $0.20 | $1.20 | over 272K: $0.40 / $1.80 | $0.020 | $0.10 / $0.60 | 1.05M | Details for GPT-5.6 Luna |
Previous budget tier (GA Jul 9, 2026). Cut 80% from $1.00/$6.00 on Jul 30, 2026. GPT-6 Luna ($0.10/$0.50, Sep 22) now undercuts it on both input and output. Cached read $0.02, cache write $0.25 (1.25x input). 2x in/1.5x out above 272K. | ||||||||
| GPT-5.5 | Flagship | $5.00 | $30.00 | over 272K: $10.00 / $45.00 | $0.50 | $2.50 / $15.00 | 1.05M | Details for GPT-5.5 |
Earlier flagship (Apr 2026). GPT-5.6 Sol's promotional rate and GPT-6.1 Sol ($2/$10) both undercut it. Cached input $0.50. 2x in/1.5x out above 272K. | ||||||||
| GPT-5.5 Pro | Flagship | $30.00 | $180.00 | over 272K: $60.00 / $270.00 | — | $15.00 / $90.00 | 1.05M | Details for GPT-5.5 Pro |
Highest-precision flagship variant (GA). Most expensive model tracked. $60/$270 above 272K. | ||||||||
| GPT-5.4 | Flagship | $2.50 | $15.00 | over 272K: $5.00 / $22.50 | $0.25 | $1.25 / $7.50 | 1.05M | Details for GPT-5.4 |
Previous flagship. Cached input $0.25. 2x in/1.5x out above 272K. | ||||||||
| GPT-5.4 Mini | Mid-tier | $0.75 | $4.50 | — | — | $0.38 / $2.25 | 400K | Details for GPT-5.4 Mini |
Balanced performance and cost. | ||||||||
| Legacy models (1) | ||||||||
| GPT-5.4 Nano Legacy | Budget | $0.20 | $1.25 | — | — | $0.10 / $0.63 | 400K | Details for GPT-5.4 Nano |
Cheapest GPT-5.4 model. Deprecated Oct 1, 2026: API shutdown Apr 1, 2027, with GPT-6 Luna ($0.10/$0.50) as OpenAI's recommended replacement. | ||||||||
No models match those filters
Subscription or API?
What each plan’s monthly price buys on the API, as arithmetic: GPT-6.1 Sol at list rates of $2.00 input and $10.00 output per 1M tokens. Plans are priced on monthly billing. This says nothing about which models a plan includes or how much usage it allows.
| Plan | Monthly price | Chat mix | Coding mix |
|---|---|---|---|
| ChatGPT Go | $8 | about 2.0 million tokens | at most about 5.9 million tokens |
| ChatGPT Plus | $20 | about 5.0 million tokens | at most about 15 million tokens |
| ChatGPT Pro 100 | $100 | about 25 million tokens | at most about 74 million tokens |
| ChatGPT Pro 200 | $200 | about 50 million tokens | at most about 149 million tokens |
| ChatGPT Pro 500 | $500 | about 125 million tokens | at most about 372 million tokens |
UK prices as OpenAI shows them. The token figures use the US price. Subscription prices aren’t converted.
The vendor sets local prices. Where we haven’t seen OpenAI’s price in your currency, it stays in US dollars.
- Chat mix: 3 input tokens for every output token, no caching.
- Coding mix: 10 input tokens for every output token, with 80% of the input billed at the cached-input price. Cache-write costs aren’t in our data and aren’t included, so the API cost is a floor and the token figure a ceiling.
- Tokens are input plus output. Figures use base rates, with no long-prompt rate and no batch discount, because there is no request size to price.
Plans checked 11 Nov 2026. API prices checked 13 Nov 2026.
What would OpenAI cost you?
Preset to OpenAI’s current models. Adjust to your usage.
- 1GPT-6 Luna $0.0004 per request$17.50
- 2GPT-5.6 Luna $0.0008 per request$39.00
- 3GPT-5.4 Mini $0.0029 per request$146.25
- 4GPT-6.1 Terra $0.0035 per request$175.00
- 5GPT-6.1 Sol $0.0070 per request$350.00
- 6GPT-5.6 Terra $0.0078 per request$390.00
- 7GPT-5.4 $0.0098 per request$487.50
- 8GPT-5.6 Sol $0.014 per request$700.00
- 9GPT-5.5 $0.020 per request$975.00
- 10GPT-6 Astra $0.035 per request$1,750
- 11GPT-5.5 Pro $0.12 per request$5,850
50,000 requests × (1,500 in + 400 out). List prices; excludes tax and cache-write fees.
What OpenAI costs for real jobs
Three jobs priced for OpenAI’s budget, mid-tier and flagship models.
Support replies
1,000 replies a day for 30 days. 30,000 requests, 1,500 input and 300 output tokens each.
| Model | List price | Batch |
|---|---|---|
| GPT-6 LunaBudget | $9.00 | $4.50 |
| GPT-6.1 SolMid-tier | $180.00 | $90.00 |
| GPT-6 AstraFlagship | $900.00 | $450.00 |
Coding agent session
One session of 40 requests that mostly re-read the same code. 40 requests, 60,000 input and 1,500 output tokens each; where a cached price exists, 80% of the input is billed at it.
| Model | List price | Batch | Cached (80% of input) |
|---|---|---|---|
| GPT-6 LunaBudget | $0.27 | $0.14 | $0.097 |
| GPT-6.1 SolMid-tier | $5.40 | $2.70 | $1.75 |
| GPT-6 AstraFlagship | $27.00 | $13.50 | $9.72 |
Long document review
50 documents a month. 50 requests, 120,000 input and 2,000 output tokens each.
| Model | List price | Batch |
|---|---|---|
| GPT-6 LunaBudget | $0.65 | $0.33 |
| GPT-6.1 SolMid-tier | $13.00 | $6.50 |
| GPT-6 AstraFlagship | $65.00 | $32.50 |
Totals are for all the requests in each example, in US dollars, from the same cost function as the calculator above.
Is there a free API tier?
OpenAI’s pricing page lists no free API tier.
Checked 11 Nov 2026 on OpenAI’s pricing page ↗.
How OpenAI compares
Our featured model in each tier, at list prices per million tokens (input / output).
| Tier | OpenAI | Claude | Gemini |
|---|---|---|---|
| Budget | GPT-6 Luna$0.10 / $0.50 | Claude Haiku 5.5$0.10 / $0.50 | Gemini 3.5 Flash-Lite$0.30 / $2.50 |
| Mid-tier | GPT-6.1 Sol$2.00 / $10.00 | Claude Sonnet 5.5$2.00 / $10.00 | Gemini 3.8 FlashInput$0.75 until 31 Dec 2026; $1.50 from 1 Jan 2027Output$3.75 until 31 Dec 2026; $7.50 from 1 Jan 2027 |
| Flagship | GPT-6 Astra$10.00 / $50.00 | Claude Fable 5.2$8.00 / $40.00 | Gemini 4 CarbonInput$2.00 until 30 Nov 2026; $4.00 from 1 Dec 2026Output$10.00 until 30 Nov 2026; $20.00 from 1 Dec 2026 |
Latest launches and price changes
- 26 Oct 2026 · launch · GPT-6.1 Terra
OpenAI pricing FAQ
What is the cheapest OpenAI model?
GPT-6 Luna is the cheapest current OpenAI model, at $0.10 per million input tokens and $0.50 per million output tokens, or $0.050 / $0.25 with the 50% batch discount.
How much does the OpenAI API cost?
The OpenAI API charges per token, so the cost depends on how much you send and receive. Input / output per million tokens: Budget GPT-6 Luna $0.10 / $0.50, Mid-tier GPT-6.1 Sol $2.00 / $10.00 and Flagship GPT-6 Astra $10.00 / $50.00. Batch requests cost 50% less on the models that offer it. The calculator on this page prices your own workload.
Which OpenAI model should I use?
Our featured picks are Budget: GPT-6 Luna, Mid-tier: GPT-6.1 Sol and Flagship: GPT-6 Astra. To spend less, pick the tier that fits the job and its cheapest model: For the hardest work, flagship models: GPT-5.4, GPT-5.6 Sol, GPT-5.5 and 2 more (from $2.50 / $15.00 for GPT-5.4). For everyday work, mid-tier models: GPT-5.4 Mini, GPT-6.1 Terra, GPT-6.1 Sol and GPT-5.6 Terra (from $0.75 / $4.50 for GPT-5.4 Mini). For high-volume, simple jobs, budget models: GPT-6 Luna and GPT-5.6 Luna (from $0.10 / $0.50 for GPT-6 Luna). Prices are input / output per million tokens. Tiers group models by capability, not price, so price your own workload in the calculator on this page. Announced price change: GPT-5.6 Sol $4.00/$20.00 until 30 Nov 2026; $5.00/$30.00 from 1 Dec 2026.
Does OpenAI offer batch or caching discounts?
Batch: 50% off input and output on all 11 current models, so GPT-6 Luna drops from $0.10 / $0.50 to $0.050 / $0.25 per million tokens. Prompt caching: reading cached input costs 5% to 10% of the input price on 9 of 11 current models; GPT-6 Luna's $0.10 input falls to $0.010 per million tokens when read from the cache.
What context window do OpenAI models have?
The largest is 1.05M tokens on GPT-6 Luna, GPT-5.6 Luna, GPT-6.1 Terra, GPT-6.1 Sol and 6 more, then 400K tokens on GPT-5.4 Mini. A request's prompt and its output together must fit in the window.
What does the OpenAI API cost per person each month?
It depends on how much each person uses it. At list prices, an occasional user (3 short requests a working day) costs about $0.013 a month on GPT-6 Luna, and a daily power user (40 longer requests a day) about $10.56 on GPT-5.4 Mini. The cost-per-seat calculator works it out for a whole team.
Is the OpenAI API cheaper than the Claude API?
It depends on the tier, so here is each one. Budget: GPT-6 Luna ($0.10 / $0.50) against Claude Haiku 5.5 ($0.10 / $0.50) is the same price on input and output. Mid-tier: GPT-6.1 Sol ($2.00 / $10.00) against Claude Sonnet 5.5 ($2.00 / $10.00) is the same price on input and output. Flagship: GPT-6 Astra ($10.00 / $50.00) against Claude Fable 5.2 ($8.00 / $40.00) is dearer on input and output. Prices are input / output per million tokens at list price, and each verdict uses today’s prices. We compare one featured model per tier, not every model.
How often do OpenAI API prices change?
We check OpenAI's pricing page every day, and last re-verified every price on 13 Nov 2026. Since Feb 2026 we have recorded 2 price cuts and no price rises on OpenAI models, the latest on 21 Aug 2026, plus 7 launches. The price history chart on this page shows how each tier has moved.
Price history
Input price of the cheapest OpenAI model in each tier, month by month, among the models on today’s price list.
View as a table
| Month | Flagship | Mid-tier | Budget |
|---|---|---|---|
| Feb 2026 | $2.50 | $0.75 | $0.20 |
| Mar 2026 | $2.50 | $0.75 | $0.20 |
| Apr 2026 | $2.50 | $0.75 | $0.20 |
| May 2026 | $2.50 | $0.75 | $0.20 |
| Jun 2026 | $2.50 | $0.75 | $0.20 |
| Jul 2026 | $2.50 | $0.75 | $0.20 |
| Aug 2026 | $2.50 | $0.75 | $0.20 |
| Sep 2026 | $2.50 | $0.75 | $0.20 |
| Oct 2026 | $2.50 | $0.75 | $0.10 |
| Nov 2026 | $2.50 | $0.75 | $0.10 |
Launches and price changes
- OpenAI launches GPT-5.5 ($5/$30, 1M context) — new flagship above GPT-5.4Launch
- o4-mini is $1.10/$4.40 per MTok, not $4/$16 as we listed (our listing was wrong).Correction
- OpenAI adds GPT-5.5 Pro ($30/$180, 1M context) — highest-precision flagship variantLaunch
- GPT-5.4 mini, GPT-5.4 nano, Azure GPT-5.2 and Azure GPT-5-mini have a 400K-token context window (our listing was wrong).Correction
- OpenAI GPT-5.6 family GA - Sol $5/$30, Terra $2.50/$15, Luna $1/$6 (1.05M context). New cache-write charge at 1.25x input; cached reads 10% of input.Launch
- OpenAI cuts GPT-5.6 Luna 80% ($1/$6 to $0.20/$1.20) and GPT-5.6 Terra 20% ($2.50/$15 to $2/$12), three weeks after the family's GA. Luna is now OpenAI's cheapest model and Terra undercuts GPT-5.4 on both input and output▼ Price cut
- OpenAI puts GPT-5.6 Sol on promotional pricing of $4/$20 (from $5/$30; cached input $0.40), available at least through Nov 21, 2026▼ Price cut
- OpenAI launches GPT-6 Astra, its most capable model, at $10/$50 (1.05M context; $20/$75 above 272K; 50% batch discount). Azure Foundry lists it at the same Global Standard rate, without batch pricingLaunch
- GPT-5.5, GPT-5.5 Pro and GPT-5.4 have a 1.05M-token context window, not 1M as we listed.Correction
- OpenAI launches GPT-6 Luna at $0.10/$0.50 (1.05M context), its cheapest current-generation model, alongside GPT-6 Sol at $2/$10Launch
- OpenAI launches GPT-6.1 Sol at $2/$10 (1.05M context; cached input $0.10), replacing GPT-6 Sol a week after launch and matching Claude Sonnet 5.5's price exactlyLaunch
- GPT-6.1 Terra: OpenAI launches GPT-6.1 Terra at $1/$5 (1.05M context; cached input $0.05; $2/$7.50 above 272K)Launch
- GPT-5.5 Pro bills $60/$270 for prompts over 272K input tokens (our listing was wrong).Correction
- OpenAI now says GPT-5.6 Sol's promotional pricing is available until Nov 30, 2026, having said earlier that it runs at least through Nov 21Tier change