GPT-5.6 Sol
by OpenAI
Today's price · per 1M tokens
Input
$5.00
per 1M tokens
Output
$30.00
per 1M tokens
Blended
$17.50
avg of input & output $/1M
Cached input
$0.500
10% of input — prompt caching
Source: official OpenAI pricing · read Jul 9, 2026
MODELPRICEWATCH.COM · 2026-08-01
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. $5/$30 per 1M tokens (cached input $0.50).
Capabilities
struck through = not supportedInput 2/5
Text ✓
Image ✓
Audio
Video
PDF
Output 1/5
Text ✓
Image
Audio
Video
Embedding
Features 4/9
Prompt caching ✓
Reasoning ✓
Coding
Fast inference
Long context ✓
Open weights
Multimodal ✓
Web search
Realtime
Benchmark performance
accuracy % · higher is betterAvg benchmark score83.8%
Perf per $/Mtok4.8
GPQA Diamond
94.6%
SWE-Bench Verified
96.2%
Terminal-Bench 2.1
88.8%
BrowseComp
92.2%
OSWorld-Verified
62.6%
Humanity's Last Exam
47.2%
ARC-AGI 2
92.5%
HumanEval
96.2%
AutoBench *
18.1%
Independent composite scores
- AA Intelligence Index: 58.9 (Artificial Analysis composite across reasoning, knowledge and coding evals)
- AA Agentic Index: 54 (Tool use, planning, autonomy)
- AA-Omniscience Index: 21.7 (−100–100)
- GDPval-AA v2: 1732.5 ELO (Real-world work tasks, human baseline = 1000)
- LMSYS Chatbot Arena: 1482.8 ELO (Human preference)
How it stacks up
- Ranks #6 of 68 benchmarked models by average score
- Ranks #6 of 133 comparably-measured models by percentile score, across 13 independent measurements
- Ranks #117 of 133 comparably-tested models by normalized performance per dollar
- Strongest at SWE-Bench Verified — 96.2%, #1 of 30
53.9 tokens/sec output
Source: Vellum LLM Leaderboard · updated Aug 1, 2026 · See full rankings →
Specifications
- Provider
- OpenAI
- Context window
- 1M tokens
- Modality
- text, image
- Parameters
- Proprietary
- Open source
- No — proprietary
- Released
- Jul 9, 2026
- Status
- Current
- Last updated
- Jul 9, 2026
- Tags
Availability verified: Jul 9, 2026 — listed on OpenAI's own page