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GPT-5.3 Chat
openai·openai/gpt-5.3-chat·GA·Closed·gpt series
Chat-tuned GPT model for conversational assistance, writing, and tool workflows
At a glance
Reference price$1.75 / $14.00 per 1M
Cache read — · ZenMux
Lowest paid$1.57 / $12.60
Requesty Gateway · 1.1× spread
Context128,000
Output limit16,380
Capabilities
Reasoning✓ Tool use✓ Structured output✓ Temperature✓ Attachments
⚠ Providers report capability flags inconsistently
Modalities
TextImage
Knowledge cutoff2025-08-31
Released / updated2026-03-20 / 2026-03-20
Quality & performance
Artificial Analysis doesn't cover this model (267 of 2059 have data). Quality data comes from independent evals covering widely used models.
Available at 2 providers2 with public prices
Sorted by blended price (input×0.75 + output×0.25) asc. The official channel always shows regardless of rank. Whether a gateway's low price is actually usable can't be verified.
Your usage cost
1Requesty$774.90
2ZenMux$1,050.00
The cheapest paid channel is the only channel.
Related models
RouteLLMsame series$3.00 / $15.00GPT-Realtime-2.1same series$4.00 / $24.00NanoGPT Helpsame series$0 / $0Qwen3 Maxcheaper alternative$0.861 / $3.44Qwen3 235B-A22B Instruct 2507cheaper alternative$1.03 / $3.08Qwen3-Next 80B-A3B Instructcheaper alternative$0.144 / $0.574Qwen3-Coder 30B-A3B Instructcheaper alternative$0.216 / $0.861
Price historyone sample accumulated per data sync
Input listOutput listMin blended