Plain-English Summary
Very small GPT-5 model for classification, extraction, and routing.
GPT-5 nano
Very small GPT-5 model for classification, extraction, and routing.
GPT-5
Reasoning LLM
Legacy / available
Open weights: No
API: Yes
Technical Notes
Multimodal GPT-5-family model with 400K context, 128K output, tool calling, and structured outputs.
Best For
High-volume text and vision workloads
Watch Out For
Older generation than GPT-5.6; capability and lifecycle may change.
Model Specs
- Maker
- OpenAI
- Country
- USA
- Family
- GPT-5
- Type
- Reasoning LLM
- Release date
- 2025-08-07
- Date confidence
- Exact
- Status
- Legacy / available
- Context window
- 400,000 tokens
- Max output
- 128,000
- Parameters
- Not disclosed
- Active parameters
- Not disclosed
- Architecture
- Proprietary multimodal transformer
- Reasoning
- Yes
- Tool calling
- Yes
- Structured output
- Yes
- API available
- Yes
- Open weights
- No
- Self-hostable
- No
- License
- Proprietary
- Inputs
- Text, image
- Outputs
- Text
- Approx. price
- $0.05 input / $0.40 output per 1M tokens
- How to access
- Provider website or API
- Model / API ID
- gpt-5-nano
- Knowledge cutoff
- Not publicly disclosed
- Fine-tuning
- Prompting / RAG
- Completeness
- 90 %
- Verified
- Jul 18, 2026
- Snapshot date
- Jul 18, 2026
- Source
- Official source