OpenAI: GPT-5.2-Codex vs Thinking Machines: Inkling
Thinking Machines: Inkling wins on more metrics (5 of 6), but the right pick depends on what you optimize for — see the breakdown below.
| Metric | OpenAI: GPT-5.2-Codex | Thinking Machines: Inkling |
|---|---|---|
| Intelligence Index | 40.1 | 40.7✓ |
| Coding Index | — | 52.1✓ |
| GPQA Diamond | 90%✓ | 87% |
| Design Arena Elo | — | — |
| Speed (tokens/sec) | — | — |
| Latency | — | — |
| Input price /M | $1.75 | $1.00✓ |
| Output price /M | $14.00 | $4.05✓ |
| Context window | 400K | 1.0M✓ |
| Capabilities | ReasoningToolsJSONVision | ReasoningToolsVisionAudio |