Today's price · per 1M tokens
Input
$2.00
per 1M tokens
Output
$12.00
per 1M tokens
Blended
$4.50
blended $/1M — 3:1 weighted input:output
Cached input
$0.200
10% of input — prompt caching
Price receipt
We read OpenAI's own pricing page on and found gpt-5.6-terra listed with a price on the same row — that read is where the number above comes from. We keep the page text we read; its content hash is 5eccd5f933.
Overview
Balanced GPT-5.6 tier trading a step of intelligence for lower cost — the mid capability tier in the Sol/Terra/Luna scheme. 1.05M context, 128K max output, text + image input. $2/$12 per 1M tokens (cached input $0.20). Succeeded on 2026-10-26 by GPT-6.1 Terra at $1/$5; GPT-5.6 Terra is still on OpenAI's rate card and not on its deprecations list.
Capabilities
struck through = not supportedBenchmark performance
accuracy % · higher is better- AA Intelligence Index: 42.1 (Artificial Analysis composite across reasoning, knowledge and coding evals)
- AA-Omniscience Index: -9.3 (−100–100)
- GDPval-AA v2: 1462 ELO (Real-world work tasks, human baseline = 1000)
- LMSYS Chatbot Arena: 1467.3 ELO (Human preference)
- Ranks #13 of 100 benchmarked models by average score
- Ranks #32 of 194 comparably-measured models by percentile score, across 10 independent measurements
- Ranks #154 of 194 comparably-tested models by normalized performance per dollar
- Strongest at SWE-Bench Verified — 95.4%, #4 of 38
135.5 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