GPT-5.6 Sol in OpenAI Codex
OpenAI - Powerful
In OpenAI Codex, GPT-5.6 Sol meters at 125 credits per 1M input tokens and 750 per 1M output tokens. At $0.04 per credit that is exactly $5.00 and $30.00 per 1M tokens, the same as calling the OpenAI API directly. A typical daily-coding request works out to about 2 credits (about $0.08). Verified against OpenAI's Codex rate card on 2026-07-21.
Credit rate card
- Credits / 1M in
- 125
- Credits / 1M cached
- 12.5
- Credits / 1M out
- 750
- Cost per credit
- $0.04
Credits per request
Defined workload baskets, not measured tasks.
| Workload | Credits | Cost | Direct API cost |
|---|---|---|---|
| Short chat turn | 1.0 | $0.04 | $0.04 |
| Daily coding request | 1.9 | $0.08 | $0.08 |
| Agent session step | 6.6 | $0.26 | $0.26 |
At about 1.9 credits per daily-coding request, GPT-5.6 Sol ranks #4 of 4 current-generation models by cost, about 6.6x the cheapest (GPT-5.4 mini).
Credit-to-API parity
The implied dollar value of a credit spent on GPT-5.6 Sol, backed out from the direct API rate card divided by the credit rate card. It should land on $0.04 for both input and output.
- Implied $ / credit, input
- $0.04
- Implied $ / credit, output
- $0.04
- Markup at the daily workload
- 0.00%
- Ratio match
- Exact
Input : cached : output ratio in credits is 10 : 1 : 60, versus 10 : 1 : 60 in direct API dollars.