GPT-6 Luna

Language OpenAI Verified Released Sep 22, 2026

In Input modalities: TextImage Out Output modalities: Text
Reasoning· none, low, medium, high, xhigh, max
Reasoning can be off
Tool use
Structured output

Prices

3 offerings · prices as listed

OpenAI API Global · USD gpt-6-luna

Conditions/ 1M tokens	Input	Cache read	Cache write	Cache write		Output
Conditions/ 1M tokens	Input	Cache read	Cache write	30-minute cache	12-hour cache	Output
Standard	$0.10	$0.010	$0.125	$0.125	$0.25	$0.50
Prompts over 272K tokens	$0.20	$0.020	—	$0.25	$0.50	$0.75
Flex tier	$0.050	$0.005	—	$0.0625	$0.125	$0.25
Fast tier	$0.20	$0.020	—	$0.25	$0.50	$1.00
Batch	$0.050	$0.005	—	$0.0625	$0.125	$0.25
Prompts over 272K tokensFlex tier	$0.10	$0.010	—	$0.125	$0.25	$0.375
Prompts over 272K tokensFast tier	$0.40	$0.040	—	$0.50	$1.00	$1.50
Prompts over 272K tokensBatch	$0.10	$0.010	—	$0.125	$0.25	$0.375

Prices from OpenAI API pricing (opens in a new tab) (checked Nov 9, 2026) · GPT-6 Luna (opens in a new tab) (checked Nov 9, 2026)

Standard: the price a request with no conditions pays (the headline price elsewhere on the site).

Details

Max input: 922K
Knowledge cutoff: May 2026
Open weights: —
Family: gpt-luna
Model ID

Not stated on OpenAI’s pages: max thinking budget, built-in tools, aliases.

Cited scores

From third-party leaderboards, not measured by us

Epoch Capabilities Index 156.7

#32 of 118 listed models · CI 154.8–158.7
LMArena Text 1,441

#63 of 163 listed models · max effort · CI 1,436–1,445 · 105,592 votes
Epoch AI · Chess Puzzles 36%

#43 of 85 listed models · max effort · ±4.82
Epoch AI · FrontierMath Tier 4 v2 56.1%

#18 of 65 listed models · max effort · ±7.85

Epoch AI, 'Capabilities & benchmarking'. Published online at epoch.ai. Retrieved from 'https://epoch.ai/benchmarks'. Licensed CC BY 4.0. · License · as of Oct 28 – Nov 5, 2026
LMArena (Arena), leaderboard-dataset on Hugging Face, licensed CC BY 4.0 · License · as of Nov 8, 2026
LiveBench (White et al.), release 2026-06-25, livebench.ai, licensed CC BY-SA 4.0. This board, adapted from it, is shared under CC BY-SA 4.0. · License · as of Jun 25, 2026
Terminal-Bench 4.0 leaderboard (Marten, Shaw et al., Terminal-Bench; harbor-framework/terminal-bench on GitHub), licensed Apache-2.0. · License · as of Sep 29, 2026
changes we made

Provider-reported scores

Published by OpenAI, under the conditions it states

Benchmark	Setting	Score
DeepSWE 1.1	max effort	66.6%

Included in coding plans

ChatGPT plans for Codex Free Free
ChatGPT plans for Codex Go $8.00 / month
ChatGPT plans for Codex Plus $20.00 / month

Estimated 350–3,000 messages every 5 hours · local messages
ChatGPT plans for Codex Business $25.00 / month

Estimated 350–3,000 messages every 5 hours · local messages
GitHub Copilot Pro $10.00 / month

1,500 credits per month
Variable additional usage on top of your base. Flex allotments may change over time.
15 USD of usage per month
GitHub Copilot Pro+ $39.00 / month

7,000 credits per month
Variable additional usage on top of your base. Flex allotments may change over time.
70 USD of usage per month
GitHub Copilot Max $100.00 / month

20,000 credits per month
Variable additional usage on top of your base. Flex allotments may change over time.
GitHub Copilot Business $19.00 / month

1,900 credits per month
GitHub Copilot Enterprise $39.00 / month

3,900 credits per month

All coding plans →

News

All news →

Oct 22, 2026Capability OpenAI makes Decisions API generally available for GPT-6 Luna The Decisions API is generally available with gpt-6-luna. Requests can include up to 400 questions, up from 200 in public beta, and support shared-input caching, images in question instructions, and structured data through input_json.
Oct 15, 2026Capability OpenAI integrates Decisions with GPT-Live The v1/live/sessions API now supports native delegation from GPT-Live to Decisions, as well as triggering decisions as input or output transcript deltas arrive. The integration covers gpt-live-1 and gpt-6-luna.
Oct 6, 2026Capability OpenAI launches Decisions API beta for GPT-6 Luna OpenAI released the Decisions API in beta with GPT-6 Luna. It accepts text and images and returns typed answers; the announcement says it is 10 times faster than the Responses API.
Sep 22, 2026Release OpenAI releases GPT-6 Sol and GPT-6 Luna OpenAI released GPT-6 Sol (gpt-6-sol) and GPT-6 Luna (gpt-6-luna), reasoning models that take text and images and return text through the Responses and Chat Completions APIs. Standard prices per 1M tokens for prompts of up to 272K input tokens: Sol $2 input, $0.20 cached input, $10 output; Luna $0.10, $0.01 and $0.50.
Sep 22, 2026Capability OpenAI improves prompt caching for GPT-6 OpenAI says GPT-6 models hit the prompt cache more often by default, and discounts now apply to shared prefixes reused within 30 minutes. New tools include a caching dashboard, a diagnostics tool that explains cache misses, explicit cache breakpoints, and changing reasoning effort mid-conversation without losing the cache.

Changes

All changes →

Sep 27, 2026 4 prices dropped on OpenAI API Input (Prompts over 272K tokens, Fast tier) $0.40 · Cache read (Prompts over 272K tokens, Fast tier) $0.040 · Cache write (Prompts over 272K tokens, Fast tier) $0.50 · Output (Prompts over 272K tokens, Fast tier) $1.50
Sep 26, 2026 New language model

Sources

Introducing GPT-6 Sol and Luna (opens in a new tab) openai.com · checked Sep 26, 2026
Azure OpenAI pricing (opens in a new tab) azure.microsoft.com · checked Nov 8, 2026
OpenAI API pricing (opens in a new tab) developers.openai.com · checked Nov 9, 2026
GPT-6 Luna (opens in a new tab) developers.openai.com · checked Nov 9, 2026
Changelog (opens in a new tab) developers.openai.com · checked Nov 9, 2026
GPT-6 Luna (opens in a new tab) developers.openai.com · checked Nov 9, 2026

OpenAI’s official policies: data use, privacy, terms →

OpenAI · United States · openai.com

Snapshots, the same family and other models from this provider