GPT-5.6 Sol
OpenAI · released 9 Jul 2026 · proprietary API
- Largest context window (9-way tie)
Top GPT-5.6 tier for complex coding, research, and agentic work; below GPT-6 Astra since 2026-09-05.
Context window
1.05M
1,050,000 tokens
Input price
$4
per 1M tokens
Output price
$20
per 1M tokens
Blended
$8
3:1 in:out mix
Weights
Proprietary
API only
Released
9 Jul 2026
OpenAI
Long-context / tier pricing — Promotional pricing OpenAI says runs at least through 2026-11-21; on 2026-08-17 this row was $5 in / $30 out. >272K input billed at the long-context tier ($8 in / $30 out per 1M); cached input $0.40/1M. Listed prices are the base rate for prompts up to ~200K tokens.
Where it ranks
Of 42 models tracked.
Cost to run
#34(tied)
of 42
Input price
#34(tied)
of 42
Context window
#1(tied)
of 42
Compare with
The nearest models by blended cost to run.
Put it to work
Specs from BitByteCore's hand-verified Frontier Ledger (v2026-10-01), this row verified 3 Sep 2026 against OpenAI's official pricing ↗. Model pricing moves fast, so confirm with OpenAI before you rely on a figure.