Updated
Claude Opus 5.5 vs GPT-6 Astra
GPT-6 Astra had 14% fewer counted bugs per line than Claude Opus 5.5 (0.95 vs 1.11).
| Claude Opus 5.5 | GPT-6 Astra | |
|---|---|---|
| Bug rate | ||
| Relative bug rate | 1.11 | 0.95 |
| Rank | #6 of 7 | #4 of 7 |
| By language | ||
| TypeScript(statistically tied) | 1.02 | 1.08 |
| JavaScript | 1.28 | 1.63 |
| Python | 1.01 | 1.18 |
| Go | 1.22 | 0.88 |
| Rust | 1.19 | 0.36 |
| Swift(statistically tied) | 0.84 | 0.90 |
| C# | 1.22 | 0.60 |
| Ruby(statistically tied) | 0.98 | 1.25 |
| SQL(statistically tied) | 0.73 | 0.94 |
| Shell(statistically tied) | 1.01 | 0.67 |
| Vue(statistically tied) | 1.39 | 0.69 |
| Svelte | 0.69 | 2.24 |
| Terraform | 0.94 | 0.44 |
| Details | ||
| Provider | Anthropic | OpenAI |
| Released | Sep 22, 2026 | Sep 4, 2026 |
| List price | $4 input / $20 output per 1M tokens | $10 input / $50 output per 1M tokens |
| Share of AI-written code, week of Nov 2 | 66.2% | 4.5% |
1.00 = average · lower is better · = statistically tied
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Questions and answers
- Which has fewer bugs, Claude Opus 5.5 or GPT-6 Astra?
- GPT-6 Astra had 14% fewer counted bugs per line than Claude Opus 5.5 (0.95 vs 1.11). GPT-6 Astra ranks #4 of 7 and Claude Opus 5.5 #6.
- Which is cheaper, Claude Opus 5.5 or GPT-6 Astra?
- Claude Opus 5.5 lists at $4 input / $20 output per 1M tokens; GPT-6 Astra lists at $10 input / $50 output per 1M tokens. Claude Opus 5.5 has the lower list price.
- Does it depend on the programming language?
- In TypeScript, they were statistically tied (1.02 and 1.08); in JavaScript, Claude Opus 5.5 had the lower rate (1.28 vs 1.63); in Python, Claude Opus 5.5 had the lower rate (1.01 vs 1.18); in Go, GPT-6 Astra had the lower rate (0.88 vs 1.22); in Rust, GPT-6 Astra had the lower rate (0.36 vs 1.19); in Swift, they were statistically tied (0.84 and 0.90); in C#, GPT-6 Astra had the lower rate (0.60 vs 1.22); in Ruby, they were statistically tied (0.98 and 1.25); in SQL, they were statistically tied (0.73 and 0.94); in shell scripts, they were statistically tied (1.01 and 0.67); in Vue, they were statistically tied (1.39 and 0.69); in Svelte, Claude Opus 5.5 had the lower rate (0.69 vs 2.24); in Terraform, GPT-6 Astra had the lower rate (0.44 vs 0.94).
- Which is used more, Claude Opus 5.5 or GPT-6 Astra?
- Claude Opus 5.5, with 66.2% of the AI-written code reviewed by cubic in the week of Nov 2, 2026, against 4.5% for GPT-6 Astra.