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OpenAI Releases First Open-Weight Reasoning Models in Over Five Years

OpenAI launched two open-weight AI reasoning models (gpt-oss-120b and gpt-oss-20b) with capabilities similar to its o-series, marking the company's first open model release since GPT-2 over five years ago. The models outperform competing open models from Chinese labs like DeepSeek on several benchmarks but have significantly higher hallucination rates than OpenAI's proprietary models. This strategic shift toward open-source development comes amid competitive pressure from Chinese AI labs and encouragement from the Trump Administration to promote American AI values globally.