API version 2 is now the default, with stricter validation and reasoning_logprobs

As of July 22, 2026, API version 2 is the default.

Version 2 includes:

• Stricter schema validation for structured outputs
• Stricter validation for multi-turn tool-calling messages
• A separate reasoning_logprobs response field for reasoning-token logprobs
• Corrected Unicode handling in logprobs

Z.ai GLM 4.7 is scheduled for deprecation on August 17, 2026. It will retain its existing default logprobs response behavior and will not receive the separate reasoning_logprobs default before then. Requests that explicitly include X-Cerebras-Version-Patch: 2 can receive the separated reasoning_logprobs behavior. This affects only the placement of reasoning-token logprobs. See the GLM 4.7 deprecation notice.