GLM: GLM 5.3 Flash
glm5.3-flashGLM 5.3 Flash is an open-weight 321B-parameter (18B active) reasoning model with a 262k context window, hosted by Reka. It is served over an OpenAI-compatible API with native tool calling, structured outputs, logprobs, and streaming.
- Modalities
- →
- In / out price
- $0.15 / $0.50 per 1M
- Context
- 262k
- Max output
- 262,144 tokens
ChatMulti-turn conversations via /v1/chat/completions.ChatStreamingTokens arrive as they are generated with stream: true.StreamingImage inputAccepts images alongside text in the prompt.Image inputTool callingNative tool calls, including parallel calls.Tool callingReasoningThinks before answering; the trace is billed as output.ReasoningStructured outputsJSON Schema responses; JSON mode on most models.Structured outputsLogprobsReturns token log-probabilities with logprobs: true.LogprobsPrompt cachingRepeated prompt prefixes bill at the cache-read rate.Prompt caching