GPT-5.6 Sol in OpenAI Codex
OpenAI - Powerful
In OpenAI Codex, GPT-5.6 Sol meters at 100 credits per 1M input tokens and 500 per 1M output tokens. At $0.04 per credit that is exactly $4.00 and $20.00 per 1M tokens, the same as calling the OpenAI API directly. A typical daily-coding request works out to about 1.4 credits (about $0.06). Verified against OpenAI's Codex rate card on 2026-08-22.
Credit rate card
- Credits / 1M in
- 100
- Credits / 1M cached
- 10
- Credits / 1M out
- 500
- Cost per credit
- $0.04
Credits per request
Defined workload baskets, not measured tasks.
| Workload | Credits | Cost | Direct API cost |
|---|---|---|---|
| Short chat turn | 0.7 | $0.03 | $0.03 |
| Daily coding request | 1.4 | $0.06 | $0.06 |
| Agent session step | 4.7 | $0.19 | $0.19 |
At about 1.4 credits per daily-coding request, GPT-5.6 Sol ranks #4 of 4 current-generation models by cost, about 18.1x the cheapest (GPT-5.6 Luna).
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 : 50, versus 10 : 1 : 50 in direct API dollars.