GPT-5.6 Sol
- Score
- 47 · rank 13
- Price
- Paid
- API
- No
- Weights
- No
WHAT IT DOES
GPT-5.6 Sol is the highest-capability model in OpenAI's GPT-5.6 family, released July 9, 2026 after a limited preview starting June 26. It has a 1.05M-token context window with up to 128K output tokens, and is positioned for complex professional work: advanced coding, scientific and technical reasoning, long-document analysis, computer use, and multistep agent workflows. It sits alongside the cheaper Terra and Luna tiers in the same family: Sol is $5 input and $30 output per million tokens, Terra $2.50 and $15, Luna $1 and $6, and on July 30, 2026 OpenAI cut Luna's price by 80% and Terra's by 20%. Free and Go users of ChatGPT get Terra; paid users choose any of the three and set effort per model.
WHY WE PICKED IT
Sol ranks third overall on the Artificial Analysis Intelligence Index at 58.9, behind Claude Opus 5 and Claude Fable 5, a genuine top-tier frontier model rather than an incremental update, and OpenAI's clear flagship pick for the hardest professional-grade tasks.
QUICK FACTS
STRENGTHS
- ✓#2 overall on the Artificial Analysis Intelligence Index (58.9%)
- ✓1.05M-token context window with a 128K output ceiling
- ✓Purpose-built for advanced coding and scientific/technical reasoning
- ✓Strong computer-use and multistep agent workflow support
- ✓Part of a tiered family (Sol/Terra/Luna) for matching cost to task difficulty
LIMITATIONS
- ⚠Premium pricing, especially above the 272K-token context threshold
- ⚠Overkill (and expensive) for simple tasks better suited to Terra or Luna
- ⚠Newly released, limited long-term reliability data so far
- ⚠Output tokens cost 6x input tokens
GETTING STARTED
Access GPT-5.6 Sol via the OpenAI API. Standard short-context pricing is $5/M input and $30/M output tokens; requests above 272K input tokens are billed at $10/M input and $45/M output for the full request. Reserve Sol for your hardest tasks and use the cheaper Terra or Luna tiers for everyday work to control cost.
BENCHMARKS
QUICK TIPS
USE CASE EXAMPLES
Whole-Codebase Technical Analysis
Analyze and refactor a large codebase using the full context window.
- Load the relevant codebase into context
- Ask for an architecture-level review
- Request specific refactor recommendations
- Review and approve changes incrementally
- Run tests and iterate on failures
Multistep Research Agent
Run a long, multi-tool research and synthesis workflow.
- Define the research question and constraints
- Let Sol plan a multistep approach
- Execute tool calls for retrieval and analysis
- Synthesize findings into a structured report
- Verify key claims before finalizing
PRICING
Requires a paid subscription.
FEATURED IN GUIDES
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EXPLORE ALTERNATIVES
Compare GPT-5.6 Sol with 5+ similar llms AI tools.
FREQUENTLY ASKED QUESTIONS
Is GPT-5.6 Sol free?
No, GPT-5.6 Sol requires a paid subscription.
Does GPT-5.6 Sol have an API?
No, GPT-5.6 Sol does not appear to offer a public API.
What is GPT-5.6 Sol best for?
GPT-5.6 Sol is best for Professional-Grade Reasoning. GPT-5. Sol ranks third overall on the Artificial Analysis Intelligence Index at 58.9, behind Claude Opus 5 and Claude Fable 5, a genuine top-tier frontier model rather than an incremental update, and OpenAI's clear flagship pick for the hardest professional-grade tasks.
What platforms does GPT-5.6 Sol support?
GPT-5.6 Sol supports web, api.
Is GPT-5.6 Sol open source?
No, GPT-5.6 Sol is not open source.
How do I get started with GPT-5.6 Sol?
Access GPT-5.6 Sol via the OpenAI API. Standard short-context pricing is $5/M input and $30/M output tokens; requests above 272K input tokens are billed at $10/M input and $45/M output for the full request. Reserve Sol for your hardest tasks and use the cheaper Terra or Luna tiers for everyday work ...
How do I use GPT-5.6 Sol?
GPT-5.6 Sol is a large language model for text generation, analysis, and conversation. Access through the web interface. Enter prompts or questions to get responses. It excels at #2 overall on the artificial analysis intelligence index (58.9%).
FEATURED ON CURATEDAI
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