OpenAI and Microsoft launch typed decision APIs for AI agents

On October 6 OpenAI opened public beta of its Decisions API (POST /v1/decisions) returning typed answers: a probability, a choice, or a score. On October 9 Microsoft shipped Decision-1 in Foundry, a post-trained Qwen3.5-9B for single-pass decision scoring at $0.042 per million input tokens with free output. SGLang and vLLM added matching endpoints.

• OpenAI Decisions API runs only on gpt-6-luna at $0.10 per 1M input tokens
• Microsoft Decision-1: Qwen3.5-9B, $0.042 per 1M input tokens, output free
• Vendor claims 4.5x faster than Quyet-1.0-Large and 35x faster than GPT-6 Sol at P50
• SGLang added /v1/decisions, vLLM merged /v1/systemone