GPT-5.6 Luna
consumerEfficient proprietary dense model from OpenAI, the cost-optimized sibling of GPT-5.6 Sol. Same 1,050,000-token context and 128K max output as Sol. Text + image in, text out. Reasoning effort spans none through max; medium is default.
- Pricing: $0.20/1M input, $1.20/1M output.
Agents on Rails benchmark (Aug 2026, Le Mans round). 73.0% accuracy on 63 runs at default effort for only $0.014 mean cost - the cheapest run in the 16-model field by a wide margin. Scaling reasoning effort lifted it to 86% at $1.36 (high) and 89% at $2.34 (xhigh) in the earlier 8-model round. The headline finding still holds: “a dollar gets you most of the way.”
AI-generated content marks
The provider reports that this model does not add embedded watermarks or provenance metadata to generated output.
- 1050k
- proprietary
- 🇺🇸 USA
- Aug 2026
Scores
Score per dollar
410 pts per $/M input
general_score (82) divided by cheapest input price ($0.20/M). Higher is better value. See live pricing.
Related models
Guides covering GPT-5.6 Luna
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Live per-provider pricing, throughput and uptime - refreshed about 1 month ago via OpenRouter. Click a column to sort.
some pricing may be stale - last verified 2026-08-15
| Provider | Type | Input $/M | Output $/M | Cache $/M | Tok/s | Latency | Uptime | Value |
|---|---|---|---|---|---|---|---|---|
|
OpenAI
stale
|
API | 0.20 | 1.20 | - | - | - | - | cheapest |
|
DigitalOcean
stale
|
API | 0.20 | 1.20 | 0.020 | - | - | - | |
| Sub | - | - | - | - | - | - | $10.00/mo Go ($5 first month) |
Default order: throughput among 95%+ uptime providers, then latency; subscriptions last. Sort by any column. Subscription rows show $/mo in the Value column - per-token columns are "-". Affiliate links are marked sponsored / nofollow. Confirm current pricing on the provider's site before committing.
Detailed API pricing page + JSON endpoint →
Inference cost over time
Data accumulates from the first daily sync - longer ranges populate over time. Prices come from OpenRouter snapshots, not a historical API.