GPT-6.1 Sol in OpenAI Codex
OpenAI - Powerful
In OpenAI Codex, GPT-6.1 Sol meters at 50 credits per 1M input tokens and 250 per 1M output tokens. At $0.04 per credit that is exactly $2.00 and $10.00 per 1M tokens, the same as calling the OpenAI API directly. A typical daily-coding request works out to about 0.7 credits (about $0.03). Verified against OpenAI's Codex rate card on 2026-10-12.
Credit rate card
- Credits / 1M in
- 50
- Credits / 1M cached
- 2.5
- Credits / 1M out
- 250
- Cost per credit
- $0.04
Credits per request
Defined workload baskets, not measured tasks.
| Workload | Credits | Cost | Direct API cost |
|---|---|---|---|
| Short chat turn | 0.4 | $0.01 | $0.01 |
| Daily coding request | 0.7 | $0.03 | $0.03 |
| Agent session step | 2.3 | $0.09 | $0.09 |
At about 0.7 credits per daily-coding request, GPT-6.1 Sol ranks #4 of 8 current-generation models by cost, about 19.6x the cheapest (GPT-6 Luna).
Credit-to-API parity
The implied dollar value of a credit spent on GPT-6.1 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 20 : 1 : 100, versus 20 : 1 : 100 in direct API dollars.