Constrained decoding generally available, with parallel tool calling and streaming

Constrained decoding has moved to General Availability (GA) with expanded capabilities.

Supported models

Structured Outputs and Tool Calling with strict: true are now available on the following models:

• gpt-oss-120b
• llama-3.1-8b
• qwen-3-235b-a22b-instruct-2507
• qwen-3-32b
• zai-glm-4.6
• zai-glm-4.7

New capabilities

• Parallel Tool Calling + Constrained Decoding - Models that support parallel tool calling can now use constrained decoding for all tool calls in a single response
• Expanded JSON Schema support - Additional schema features are now supported
• Streaming + Reasoning + Constrained Decoding - All three features can now be used together in a single request