Today's price · per 1M tokens
Input
$4.00
per 1M tokens
Output
$20.00
per 1M tokens
Blended
$8.00
blended $/1M — 3:1 weighted input:output
Cached input
$0.400
10% of input — prompt caching
How this price is scoped: OpenAI labels this promotional pricing and states it is "available at least through November 21, 2026". That is a floor, not a reversion date — OpenAI publishes no date on which the rate goes back up, so no reversion is claimed here and no countdown is implied. Until 2026-08-21 this model billed $5 input / $0.50 cached input / $30 output per 1M tokens. OpenAI's rate card also prices this model by context length: the tracked figure is the short-context tier, and prompts over the short-context threshold bill at the long-context tier of $8 input / $0.80 cached input / $10 cache write / $30 output per 1M tokens. Cache writes bill at 1.25x the uncached input rate.
Price receipt
We read OpenAI's own pricing page on and found gpt-5.6-sol listed with a price on the same row — that read is where the number above comes from, recorded as a price drop. We keep the page text we read; its content hash is 54ef96c936.
Overview
OpenAI's highest-intelligence GPT-5.6 tier. Sol/Terra/Luna are durable capability tiers replacing the numbered-variant scheme; Sol targets the hardest coding, agentic, and research workloads. 1.05M context, 128K max output, text + image input. $4/$20 per 1M tokens (cached input $0.40) — a promotional rate OpenAI guarantees at least through 2026-11-21, down from $5/$30 on 2026-08-21.
Capabilities
struck through = not supportedBenchmark performance
accuracy % · higher is better- AA Intelligence Index: 47.1 (Artificial Analysis composite across reasoning, knowledge and coding evals)
- AA-Omniscience Index: 22 (−100–100)
- GDPval-AA v2: 1624.1 ELO (Real-world work tasks, human baseline = 1000)
- LMSYS Chatbot Arena: 1483.5 ELO (Human preference)
- Ranks #8 of 84 benchmarked models by average score
- Ranks #9 of 181 comparably-measured models by percentile score, across 12 independent measurements
- Ranks #151 of 181 comparably-tested models by normalized performance per dollar
- Strongest at BrowseComp — 92.2%, #1 of 21
53.9 tokens/sec output
Source: Vellum LLM Leaderboard · updated · See full rankings →
Specifications
- Provider
- OpenAI
- Context window
- 1M tokens
- Modality
- text, image
- Parameters
- Proprietary
- Open source
- No — proprietary
- Released
- Status
- Current
- Last updated
- Tags
Availability verified: — listed on OpenAI's own page