Every current GPT model with its real per-million-token price — input, output, and cached input — plus a calculator for your own workload and a straight comparison against Claude and Gemini.
| MODEL | INPUT $/1M | CACHED IN | OUTPUT $/1M | BLENDED | CONTEXT | YOUR COST |
|---|---|---|---|---|---|---|
GPT-6 Astra gpt-6-astra · ≥272K: 2×/1.5× | $10.00 | $1.00 | $50.00 | $20.00 | 1.05M | $35.00 |
GPT-6 Sol gpt-6-sol · ≥272K: 2×/1.5× | $2.00 | $0.20 | $10.00 | $4.00 | 1.05M | $7.00 |
GPT-6 Luna gpt-6-luna · ≥272K: 2×/1.5× | $0.10 | $0.01 | $0.50 | $0.20 | 1.05M | $0.35 |
GPT-5.6 Sol gpt-5.6-sol · promo to Nov 21 | $4.00 | $0.40 | $20.00 | $8.00 | 1.05M | $14.00 |
GPT-5.6 Terra gpt-5.6-terra · ≥272K: 2×/1.5× | $2.00 | $0.20 | $12.00 | $4.50 | 1.05M | $8.00 |
GPT-5.6 Luna gpt-5.6-luna · ≥272K: 2×/1.5× | $0.20 | $0.02 | $1.20 | $0.45 | 1.05M | $0.80 |
GPT-5.4 Mini gpt-5.4-mini | $0.75 | $0.075 | $4.50 | $1.69 | 400K | $3.00 |
GPT-5.4 Nano gpt-5.4-nano | $0.20 | $0.02 | $1.25 | $0.463 | 400K | $0.82 |
USD per 1M tokens from OpenAI’s official pricing page as of October 16, 2026. Blended assumes a 3:1 input:output ratio. Get keys at the OpenAI console.
GPT-6 arrived in September as a three-step ladder: Astra is the top-capability model at $10 input / $50 output per 1M tokens, Sol the flagship at $2 / $10, and Luna the fast tier at $0.10 / $0.50. Sol and Luna cost half of what their GPT-5.6 namesakes do, and all three share a 1.05M-token context window. The GPT-5.6 line and GPT-5.4 Mini and Nano stay on the price list for pinned workloads — note that GPT-5.6 Sol’s $4 / $20 is a promotional rate guaranteed only through November 21, 2026.
The long-context surcharge carries over to GPT-6: prompts beyond 272K input tokens bill the whole request at 2× input (cached input included) and 1.5× output — and it applies on Batch and Flex too. On Astra that means $20 / $75 per 1M. If you routinely fill a large share of the 1.05M window, price your workload at the surcharge rate.
Cached input is the discount that matters: resend the same prompt prefix and OpenAI bills those tokens at a tenth of the fresh-input rate (GPT-5.6 and GPT-6 also charge a cache-write fee of 1.25× input when a prefix is first stored). For agents and RAG apps with a long, stable system prompt, caching often cuts the input side of the bill by 80–90%.
For anything that can wait, the Batch API processes requests within 24 hours at half price on both input and output, and the Flex service tier gets the same 50% off synchronously when latency doesn’t matter — the cheapest ways to run evaluations, backfills, and bulk classification on GPT.
OpenAI bills per token, with separate input and output rates quoted per million tokens. The current GPT-6 line runs from $0.10 input / $0.50 output per 1M tokens on Luna, through $2 / $10 on Sol, up to $10 / $50 on Astra, with cached input at a tenth of the fresh rate. The table above has every current model.
GPT-6 Luna at $0.10 input / $0.50 output per 1M tokens — half the price of GPT-5.6 Luna and GPT-5.4 Nano, with the full 1.05M context and cached input at $0.01 per 1M. For most high-volume work it is the new default.
When a request repeats a prompt prefix the API has recently seen (system prompts, few-shot examples, long documents), those tokens bill at the cached rate — about 10× cheaper than fresh input. Caching happens automatically; GPT-5.6 and GPT-6 add a cache-write fee of 1.25× the input rate when a prefix is first stored. The savings show up in the cached_tokens field of the usage object.
Since the September GPT-6 launch, usually yes: Sol ($4/1M blended) undercuts Claude Opus 5.5 ($8) and Gemini 3.1 Pro ($4.50), and Luna ($0.20) is the cheapest small model of the big three — a tenth of Claude Haiku 4.5 ($2). At the very top, GPT-6 Astra and Claude Fable 5.1 are priced identically at $10 / $50. The matchup table below compares all three, tier by tier.
No — API usage is pay-as-you-go from the first token (new accounts occasionally get trial credits). A ChatGPT Plus or Pro subscription is a separate product and includes no API allowance.
Also see: Claude API pricing · Gemini API pricing · Grok API pricing · DeepSeek API pricing · Kimi API pricing · GLM API pricing · MiniMax API pricing · MiMo API pricing · all 68 models
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