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OpenAI API pricing: model costs per million tokens

The OpenAI API is pay-as-you-go developer access, billed per 1 million tokens, separately from ChatGPT subscriptions. GPT-6 Astra is $10.00 input / $50.00 output; GPT-6.1 Sol is $2.00 / $10.00; GPT-6 Luna is $0.10 / $0.50 (standard, short context).

GPT-6 Astra$10.00 in / $50.00 outper 1M, standard, short context
GPT-6.1 Sol$2.00 in / $10.00 outper 1M, standard, short context
GPT-6 Luna$0.10 in / $0.50 outper 1M, standard, short context
Batch50% offStd short-context rates halved

All OpenAI API plans

Per-seat prices in USD from the official pricing pages. “Annual billing” is the per-month price when billed annually, as the vendor states it; the yearly total is shown where published.

Swipe sideways to see all columns

OpenAI API plans and prices (USD, excl. tax)
PlanMonthly billingAnnual billingSeatsUsage (as published)

Source

developers.openai.com/api/docs/pricing, checked 2026-11-05 (Asia/Colombo). Std+Batch short-context rates for Astra/Sol/Luna match our model data.

Sources: OpenAI API pricing

All LLM API rates: LLM API pricing · OpenAI.

Sources: .

OpenAI API rates (USD per 1M tokens, short context ≤272K)

OpenAI API rates (USD per 1M tokens, short context ≤272K)
FeatureGPT-6 AstraGPT-6.1 SolGPT-6 Luna
Input$10.00$2.00$0.10
Cached input$1.00$0.10$0.01
Cache write (30 min)$12.50$2.50$0.125
Output$50.00$10.00$0.50
  • Batch API is half the standard short-context rate on these models.
  • OpenAI also lists a 12-hour cache-write column ($25 / $5 / $0.25 for Astra/Sol/Luna); that window is not modelled in our dataset yet.
  • GPT-6.1 Terra is listed on OpenAI’s page but has no model YAML yet: price not verified here.
  • Long-context rows (prompts over 272K) were not re-checked line by line on 2026-11-05.

Tax isn’t stated; prices shown excluding tax. Checked 2026-11-05 (Asia/Colombo).

How OpenAI API pricing works

Which model?

Start with GPT-6 Luna for high-volume simple tasks. Step up to GPT-6.1 Sol for most production chat and coding. Save GPT-6 Astra for the hardest reasoning. If you don’t need results right away, Batch halves the cost.

API vs ChatGPT

ChatGPT plans don’t include API usage. The API is billed separately.

GPT-6.1 Terra

It’s on OpenAI’s page, but it isn’t in our model data yet, so: price not verified here.

Related

OpenAI API pricing FAQ

How much does the OpenAI API cost?
GPT-6 Astra $10.00/$50.00, GPT-6.1 Sol $2.00/$10.00, GPT-6 Luna $0.10/$0.50 per 1M (standard, short context).
Is Batch cheaper?
Yes. Batch rates are half the standard short-context rates for these models.
How does it compare with Anthropic?
At each tier the list prices match. See OpenAI API vs Anthropic API.
Does ChatGPT Business include API credits?
No. The API is billed separately.