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GPT-5.4

2 articles First covered Apr 23, 2026, latest Apr 24, 2026

DeepSeek social card from the V4 API documentation release post.

DeepSeek V4 lands: 1.6T-param open MoE, 1M-token context, and SWE-bench within 0.2 of Opus 4.6

DeepSeek shipped V4-Pro and V4-Flash under MIT on April 24. V4-Pro hits 80.6% on SWE-bench Verified. V4-Flash is $0.14 in / $0.28 out.

OpenAI's GPT-5.5 model launch with ChatGPT and Codex interfaces

OpenAI shipped GPT-5.5 seven weeks after 5.4. API tokens now cost twice as much.

OpenAI released GPT-5.5 (codename Spud) on April 23. The API runs at $5/$30 per million tokens, double GPT-5.4, with Pro at $30/$180.