Updated
GPT-5.5 vs GPT-5.6 Sol
GPT-5.5 had 36% fewer counted bugs per line than GPT-5.6 Sol (0.47 vs 0.73).
| GPT-5.5 | GPT-5.6 Sol | |
|---|---|---|
| Bug rate | ||
| Relative bug rate | 0.47 | 0.73 |
| Rank | #1 of 9 | #3 of 9 |
| By coding agent | ||
| Codex | 0.42 | 0.71 |
| Cursor | 0.88 | 1.56 |
| Details | ||
| Provider | OpenAI | OpenAI |
| Released | Apr 23, 2026 | Jul 9, 2026 |
| List price | $5 input / $30 output per 1M tokens | $4 input / $20 output per 1M tokens |
| Share of AI-written code, week of Sep 14 | 0.1% | 7.2% |
1.00 = average · lower is better
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Questions and answers
- Which has fewer bugs, GPT-5.5 or GPT-5.6 Sol?
- GPT-5.5 had 36% fewer counted bugs per line than GPT-5.6 Sol (0.47 vs 0.73). GPT-5.5 ranks #1 of 9 and GPT-5.6 Sol #3.
- Which is cheaper, GPT-5.5 or GPT-5.6 Sol?
- GPT-5.5 lists at $5 input / $30 output per 1M tokens; GPT-5.6 Sol lists at $4 input / $20 output per 1M tokens. GPT-5.6 Sol has the lower list price.
- Which is used more, GPT-5.5 or GPT-5.6 Sol?
- GPT-5.6 Sol, with 7.2% of the AI-written code reviewed by cubic in the week of Sep 14, 2026, against 0.1% for GPT-5.5.