OpenAIMultimodalReleased 22 September 2026
GPT-6 Luna pricing, context and benchmark
GPT-6 Luna is the fast, cost-efficient model in OpenAI's GPT-6 series, positioned below GPT-6 Sol.
1.05M
Input context
128K
Output context
$0.1
Official input
$0.5
Official output
28
AA index
01 · Model Overview
Everything that matters, in one table
Context, pricing, cache, modalities and tooling, from the model registry and Artificial Analysis.
| Model | GPT-6 Luna |
| Model ID | openai/gpt-6-luna |
| Provider | OpenAI |
| Release date | 22 September 2026 |
| Status | Generally available |
| Input context | 1,050,000 tokens |
| Output context | 128,000 tokens |
| Official input pricing | $0.1 per 1M tokens |
| Official output pricing | $0.5 per 1M tokens |
| Cache read pricing | $0.01 per 1M tokens (90% off input) |
| Market input pricing | $0.05 per 1M (cheapest route) |
| Market output pricing | $0.25 per 1M (cheapest route) |
| Highest route pricing | $0.2 in, $1 out per 1M |
| Input modalities | file · image · text |
| Output modalities | text |
| Reasoning control | Not exposed |
| Tool support | Text generation only |
| Tokenizer | GPT |
| Provider routes | 8 endpoints |
| Artificial Analysis index | 28 (#12 of 33) |
| Speed | 104 tokens/s, 73.43s to first token |
| Knowledge cutoff | Not publicly stated |
Input and output support
| Modality | Input | Output | Billed at |
|---|---|---|---|
| Text | ✓ yes | ✓ yes | $0.1 in |
| Image | ✓ yes | no | $0.1 in |
| Audio | no | no | not supported |
| Video | no | no | not supported |
| File (PDF) | ✓ yes | no | $0.1 in |
02 · Overview
What is GPT-6 Luna?
GPT-6 Luna is the fast, cost-efficient model in OpenAI's GPT-6 series, positioned below GPT-6 Sol.
It is suited for high-volume and latency-sensitive workloads such as chat, classification, and lightweight agentic...
GPT-6 Luna carries a 1.05M token window, uses the GPT tokenizer and is served by OpenAI. On Hoodgen it sits in the Multimodal tier of the model menu next to its siblings, so you can switch mid conversation without losing the thread.
03 · Release
Release and what changed from the previous version
Released22 September 2026
| Property | GPT-6 Sol Pro | GPT-6 Luna | Change |
|---|---|---|---|
| Released | Sep 2026 | Sep 2026 | Same release window |
| Context | 1.05M | 1.05M | Unchanged |
| Max output | 128K | 128K | Unchanged |
| Input price | $2 | $0.1 | Cheaper |
| Output price | $10 | $0.5 | Cheaper |
| Input modalities | file, image, text | file, image, text | Unchanged |
| AA index | n/a | 28 | Newer benchmark run |
04 · Capabilities
Features and capabilities
◉
Vision
Screenshots, charts and photographed documents are read at the text token rate.
▤
Files and PDFs
Documents go in as files rather than pasted text, keeping layout and tables intact.
⚡
Prompt caching
Cached input costs $0.01 per million instead of $0.1, so stable prefixes get cheaper.
06 · Benchmarks
Benchmark results and performance
Artificial Analysis Intelligence Index v5.0.1 blends nine evaluations. GPT-6 Luna scores 28 , ranking #12 of 33.
Intelligence index
28
#12 of 33
Cost per task
$0.15
weighted average per index task
Time per task
12.1m
inference time
Output speed
104
tokens per second
Index score and cost per task
Scale: index 0 to 70, cost 0 to $20. Sub scores are not published per evaluation, so none are invented here.
07 · Use cases
What can you do with GPT-6 Luna?
Document understanding
Screenshots, charts, scanned pages and PDFs read in the prompt.
Mixed media briefs
One thread holding text, images and files together.
Extraction
Schema constrained JSON out of messy inputs.
Research synthesis
Several sources condensed with the figures preserved.
08 · Cost levers
Prompt caching and how to cut the bill
Cached input bills at $0.01 per million instead of $0.1, a 90% discount. Keep the system prompt and documents first and the changing question last, so every call hits the cache.
09 · Pricing
GPT-6 Luna pricing
Official pricing
List price
$0.1 / 1M in
$0.5 / 1M out
- $0.01 cached input
- 1.05M context
- file, image, text input
Cheapest route
$0.05 / 1M in
$0.25 / 1M out
- 8 routes on OpenRouter
- What Hoodgen routes to first
- Same model, lower bill
Highest route
$0.2 / 1M in
$1 / 1M out
- Priority or premium tier
- Best under load
- Use for latency critical calls
Market pricing, every route
| Provider | Tier | Input | Output | Cache read | Uptime 24h |
|---|---|---|---|---|---|
| OpenAI | flex | $0.05 | $0.25 | $0.005 | 62.5% |
| Amazon Bedrock | standard | $0.1 | $0.5 | $0.01 | 100.0% |
| OpenAI | standard | $0.1 | $0.5 | $0.01 | 97.8% |
| Azure | standard | $0.1 | $0.5 | $0.01 | 100.0% |
| Azure | standard | $0.11 | $0.55 | $0.011 | 100.0% |
| Azure | standard | $0.11 | $0.55 | $0.011 | 100.0% |
| Amazon Bedrock | standard | $0.11 | $0.55 | $0.011 | 98.9% |
| OpenAI | priority | $0.2 | $1 | $0.02 | 97.8% |
API pricing and cost calculator
| Rate | Per call | Total | Credits |
|---|---|---|---|
| Cheapest route | $0.0008 | $0.42 | 397 |
| List price | $0.0017 | $0.84 | 794 |
| Highest route | $0.0055 | $2.75 | 2613 |
10 · Developers
API and developer information
| Model ID | openai/gpt-6-luna |
| Endpoint | https://openrouter.ai/api/v1/chat/completions |
| Parameters | prompt and max_tokens |
| Streaming | Yes, server sent events |
| Modality string | text+image+file->text |
| Max prompt tokens | 1,050,000 |
| Max completion tokens | 128,000 |
curl https://openrouter.ai/api/v1/chat/completions \
-H "Authorization: Bearer $OPENROUTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "openai/gpt-6-luna",
"messages": [{ "role": "user", "content": "Summarise this document." }],
"max_tokens": 1024
}'11 · Limitations
Model limitations
| Text only output | It cannot generate images, audio or video. Pair it with an image model on Hoodgen when you need visuals. |
| Output cap | 128,000 tokens per request. Long deliverables have to be chunked. |
| Knowledge cutoff | The provider does not state a fixed cutoff for every release. Verify very recent events against search. |
12 · Comparison
GPT-6 Luna vs other OpenAI models
| Model | Context | Input /1M | Output /1M | AA index | Released |
|---|---|---|---|---|---|
| GPT-6 Luna | 1.05M | $0.1 | $0.5 | 28 | Sep 2026 |
| GPT-5.5 Pro | 1.05M | $30 | $180 | n/a | 2026 |
| GPT-5.4 Pro | 1.05M | $30 | $180 | n/a | 2026 |
| GPT-5.2 Pro | 400K | $21 | $168 | n/a | 2025 |
| o3 Pro | 200K | $20 | $80 | n/a | 2025 |
| GPT-5 Pro | 400K | $15 | $120 | n/a | 2025 |
13 · Privacy
Privacy and data policy
- On Hoodgen, prompts and attachments answer that request and stay in your conversation history so you can reopen it. They are not used to train models.
- Requests route through OpenRouter to OpenAI and are covered by that provider's API terms.
- Do not paste secrets or personal data you would not send to any hosted model.
14 · FAQ
GPT-6 Luna questions, answered
GPT-6 Luna is a multimodal model from OpenAI, released 22 September 2026. GPT-6 Luna is the fast, cost-efficient model in OpenAI's GPT-6 series, positioned below GPT-6 Sol.
✦
Start chatting with GPT-6 Luna
Free to try on Hoodgen AI, with a live credit estimate before every send. No API key, no setup.