moonshotai
GPT-6 Luna vs Kimi K3
64.6 overall · $4.14 / 1M
// openai
GPT-6 Luna
openai/gpt-6-luna
reasoningtool callingfile inputimage inputprompt caching
GPT-6 Luna costs $0.100 per 1M input tokens and $0.500 per 1M output tokens with a 1.1M-token context window.
A reasoning, tool-calling model from openai, released Sep 22, 2026. On LiveBench it scores 64.6 overall — #17 of 28 benchmarked models — and ranks highest in documents & design (#6).
- Input / 1M
- $0.100
- Output / 1M
- $0.500
- Context
- 1.1M
- LiveBench overall
- 64.6 · #17
Specs and pricing
| Input price USD per 1M prompt tokens | $0.100 |
|---|---|
| Output price USD per 1M completion tokens, reasoning included | $0.500 |
| Blended price 3:1 input:output — #83 cheapest of 350 listed models | $0.200 |
| Cached input read Blank means not priced separately — not free | $0.010 |
| Cache write | $0.125 |
| Context window | 1,050,000 tokens |
| Max output | 128,000 tokens |
| Input modalities | file, image, text |
| Tool calling | Yes |
| Extended reasoning | Yes |
| Knowledge cutoff | — |
| Listed | Sep 22, 2026 |
Also listed as openai/gpt-6-luna:batch ($0.100 blended)— the same model at a different price or rate limit.
Benchmarks by category
LiveBench scores out of 100, with GPT-6 Luna's rank among the 28 benchmarked models listed here. Run: gpt-6-luna.
What GPT-6 Luna costs to run
Monthly list cost across five workload shapes, using the published cached-input rate where there is one. A floor, not a quote — batch discounts and cache writes aren't included.
| Workload | Per month |
|---|---|
| Support chatbot 1.2K in / 400 out × 200K requests | $57.52/mo |
| RAG assistant 8K in / 600 out × 100K requests | $74.00/mo |
| Coding agent 40K in / 4K out × 20K requests | $69.60/mo |
| Document extraction 20K in / 1.5K out × 50K requests | $133.00/mo |
| Bulk classification 500 in / 20 out × 5M requests | $255.00/mo |
Compare GPT-6 Luna with
The benchmarked models closest to it on overall score.
meta
GPT-6 Luna vs Muse Spark 1.3
63.0 overall · $2.00 / 1M
minimax
GPT-6 Luna vs MiniMax M3.1 Flash
66.9 overall · $0.131 / 1M
z-ai
GPT-6 Luna vs GLM 5.3 Flash
62.1 overall · $0.237 / 1M
x-ai
GPT-6 Luna vs SpaceXAI: Grok 4.6
67.8 overall · $3.00 / 1M
openai
GPT-6 Luna vs GPT-5.6 Terra
67.8 overall · $4.50 / 1M
GPT-6 Luna FAQ
How much does GPT-6 Luna cost?
GPT-6 Luna lists at $0.100 per 1M input tokens and $0.500 per 1M output tokens, with cached input reads at $0.010 per 1M. A RAG assistant handling 100K requests a month (8K tokens in, 600 out) comes to about $74.00 at list price.
What is the context window of GPT-6 Luna?
GPT-6 Luna accepts up to 1,050,000 tokens of context and can return up to 128,000 output tokens per response.
Does GPT-6 Luna support tool calling?
Yes — GPT-6 Luna supports tool (function) calling and exposes extended reasoning. It accepts file, image, text input.
How does GPT-6 Luna score on benchmarks?
On LiveBench release 2026-10-25 (run: gpt-6-luna), GPT-6 Luna scores 64.6 overall, ranking #17 of 28 benchmarked models.
What is the API model ID for GPT-6 Luna?
On OpenRouter the model ID is "openai/gpt-6-luna". It was listed on Sep 22, 2026.
More from openai
How these numbers are produced
- Price and specs — provider list data from OpenRouter, refreshed every 15 minutes. “Blended” is a 3:1 input:output mix.
- Scores and ranks — LiveBench release 2026-10-25. Ranks count only models that have a published run; a blank means “not evaluated”, never “bad”.
- Cost per point — the measured dollars LiveBench spent on the run, divided by the score it earned.
Published benchmarks rank models on someone else's tasks. Before committing, see LLM & agent evaluation for building an eval on your own.