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GPT-5-Codex is a coding-specialized variant of GPT-5 tuned for agentic software engineering in Codex and Codex-like harnesses, handling long-running tasks such as refactors and debugging. This is the batch variant for cheaper asynchronous processing.
Claude Haiku 4.5 is Anthropic's fast, affordable small model in the Claude 4 generation, balancing strong instruction-following and coding ability with low latency. It is designed for high-throughput agentic and chat applications where speed and cost efficiency are priorities.