Model index · Text · text generation · reasoning · OpenAI · released 2026-07-09

GPT-5.6 Luna pricing

Served by 6 providers from $0.2250 to $0.4950 per 1M tokens on the standard tier — a 2.2× gap for identical weights.

Measured quality

Our own measurement (text-v1 v1), run 2026-08-12 at temperature 0 and scored by deterministic checks — no LLM judge, no vendor claim. Served by openai/gpt-5.6-luna. Basic-competence probes: 7/7 passed — only 7 of 12 could be run. Ranking probes: 5/5. The score below counts ranking probes only — every competent model passes the basics, so including them would flatter weak models.

Every probe, pass or fail

Published so the score can be audited rather than trusted. Ranking probes carry the score; basics are a floor check.

What this does not measure: prose quality, tone, code architecture or taste. Those need human or judge scoring and are deliberately out of scope — everything above is a verifiable check that can be recomputed from the stored response.

Every provider and service tier

Standard on-demand rows first, cheapest of each group first. Tiers are not interchangeable — see the note below the table.

Cheaper if your workload can wait: flex at $0.1125 per 1M on OpenAI — 50% below standard , queued at lower priority, so latency is higher and requests can be deferred under load.

* OpenRouter chooses a host for each request, and the figure above is what its default choice costs — not a fixed rate for this model. Selecting a specific host through the same account costs whatever that host charges, which is why this row can sit above or below the hosts listed beside it. Token rates are passed through from the underlying provider with no markup, so the per-1M price above is what that host charges directly — OpenRouter's own charge sits on funding instead: 5.5% (min $0.80) by Stripe or 5% by Coinbase to buy credits, 5% of the equivalent spend if you bring your own provider key. So budget about 5% above the rate shown unless you already hold credit. Fee schedule.

Compare GPT-5.6 Luna with alternatives

One model per vendor, ordered by how prominent the vendor is and how many independent providers serve the model — hosts only carry what customers ask for, so that is a real demand signal. This is not traffic or popularity data, which we do not have. Every alternative below does the same job — text generation — because a price comparison between a generator and, say, an upscaler is arithmetic rather than advice. Prices on both sides are standard on-demand rates, so the comparison is like for like — a discounted batch or flex rate is never shown against another model’s standard rate.

Prices are the cheapest host for each model, blended at a 3:1 input:output ratio. "Quality" is our own probe suite where we have run it — see what it measures. A cheaper alternative is only a real saving if it also passes on the capability your workload needs.

Frequently asked

← All models · Generated catalog of AI models and every provider that serves them, with normalised prices in USD per 1,000,000 tokens. Blended prices assume a 3:1 input:output ratio.