GPT-5.6 Sol
The basics
As of Nov 1- Status
- Price
- Context
- Open weights
Updates
Role
General-purpose model at OpenAI
Sep 2026 to now · 2 months
Sep 2026 to Sep 2026 · 1 month
Jul 2026 to Sep 2026 · 2 months
Works with
From recorded changes
App · 2 shared changes
Agent · 1 shared change
Similar models
Model
$0.20 in, $1.20 out
$2 in, $12 out
Cost vs peers
3rd cheapest of 5 similar models by output price.
Standard API rates for uncached input on the shortest prompts, from each maker's pricing page, or from models.dev for models not researched here yet.
Where it works
Prices and uptime are OpenRouter's figures for each provider's cheapest endpoint. Uptime covers the last 24 hours.
Benchmarks
Higher is better. Green is GPT-5.6 Sol. Dark marks are similar models.
Independent
What people say
Reviews (1)
Lior GrossmanShipping software since 1993, now building with AIGPT-5.6 Sol was the strongest of the GPT-5.6 models, and I used it in Codex for planning, architecture and product decisions from July to September 2026. Terra was capable for routine development, and Luna was for simple work. GPT-5.6 was really analytical and great at debugging, DevOps, adversarial code and architecture review, and deep reasoning. It was also much faster in Codex than Claude Code was for me. Like GPT-6 Astra, it's like a person with an IQ of 200 and no social skills: great at math and statistics, not great at copywriting and design.
Oct 31, 2026
Incidents
Incidents per week, last 13 weeks. Most in one week: 1.
Writing habits
Creative writing · EQ-Bench, among 51 models tracked here
Slop score
11.7
Overused AI words and phrases. Less slop than 70% of tracked models.
Repetition
3.4
Repeated words and ideas. Less repetition than 72% of tracked models.
Story length
8,548
Average characters per story. Longer than 84% of tracked models.