name = "GPT-5.3 Chat (latest)" description = "Chat-tuned GPT model for conversational assistance, writing, and tool workflows" family = "gpt" release_date = "2026-03-03" last_updated = "2026-03-03" attachment = true reasoning = false temperature = true tool_call = true structured_output = true knowledge = "2025-08-31" open_weights = false [limit] context = 128_000 output = 16_384 [modalities] input = ["text", "image"] output = ["text"]