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DeepSWE benchmark and GPT-5.5 coding performance
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OpenAI's GPT-5.5 topped the DeepSWE benchmark, a new contamination-free evaluation for long-horizon coding agents, outperforming Claude Opus 4.8 on software engineering tasks. The benchmark measures frontier AI coding capabilities and has become a key leaderboard for assessing agent performance.
- GPT-5.5 achieved higher performance than Claude Opus 4.8 on DeepSWE with lower computational cost
- DeepSWE is a contamination-free benchmark designed specifically for long-horizon coding agents
- Cognition raised $1B at $25B pre-money valuation, with $492M annualized revenue run rate
- DeepSWE benchmark launched May 26-27, 2026 and became a new AI coding leaderboard standard
[HN]hacker news5
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DeepSWE: A contamination-free benchmark for long-horizon coding agents