GPT-5.3 Chat
by OpenAIChatdeprecated 2026-08-10
Chat-tuned GPT model for conversational assistance, writing, and tool workflows
- Context
- 128K tokens
- Max output
- 16,384 tokens
- Released
- 2026-03-03
- Weights
- Closed
openai/gpt-5-3-chat · also seen as gpt-5.3-chat-latest, openai/gpt-5.3-chat-latest, us/gpt-5.3-chat, eu/gpt-5.3-chat
Specifications
Full facts as recorded, incl. what is unknown.
- Released
- 2026-03-03
- Weights
- Closed
- Input
- Text, Image
- Output
- Text
- Context window
- 128,000 max across endpoints
- Max output
- 16,384
- Providers
- 3 + 5 gateways, not counted as providers
- Epoch Capabilities Index
- not evaluated
- Direct price range
- $1.75 in at 302.AI, via gateway, fees not verified
More details
- Last updated
- 2026-03-20
- Knowledge cutoff
- 2025-08-31
Capabilities
Across all endpoints: supported if any endpoint supports it.
- Tool calling
- Parallel tools
- Structured output
- Reasoning
- Image input
- PDF input
- Audio input
- Audio outputunknown
- Video input
- Prompt caching
- Web searchunknown
- Computer useunknown
- System messagesunknown
- Assistant prefillunknown
- Temperature
- Streaming
- Attachments
Endpoints
One row per provider and variant; gateways are listed separately.
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Cost calculator
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Similarly priced models
Blended rate per 1M tokens, each at its own cheapest provider (10M input : 2M output mix).
| Model | Blended/1M | In/1M | Out/1M | Context | vs GPT-5.3 Chat |
|---|---|---|---|---|---|
| GPT-5.2 ChatOpenAI | $3.79 | $1.75 | $14 | 128K | +0% |
| GPT-5.2 CodexOpenAI | $3.79 | $1.75 | $14 | 400K | +0% |
| GPT-5.3 CodexOpenAI | $3.79 | $1.75 | $14 | 400K | +0% |
| GPT-5.3 Codex SparkOpenAI | $3.79 | $1.75 | $14 | 128K | +0% |
| GLM 5.3 PrimeZ.ai (Zhipu AI) | $3.80 | $2.80 | $8.80 | 1M | +0% |
| Command ACohere | $3.75 | $2.50 | $10 | 256K | −1% cheaper |
| Command A PlusCohere | $3.75 | $2.50 | $10 | 128K | −1% cheaper |
| Command A ReasoningCohere | $3.75 | $2.50 | $10 | 256K | −1% cheaper |
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| GPT-6.1 Sol Pro | 2026-09-29 | 1.05M | from $2.00 |
| GPT-6 Luna | 2026-09-22 | 1.05M | from $0.10 |
| GPT-6 Sol | 2026-09-22 | 1.05M | from $2.00 |
| GPT-6 Sol Pro | 2026-09-22 | 1.05M | from $2.00 |
| GPT-6 Luna Pro | 2026-09-22 | 1.05M | from $0.10 |
Heads up: prices are indicative list rates scraped from provider pricing pages; verify with the provider before relying on them. Report incorrect data for this model