What is GPT (OpenAI)?
GPT is OpenAI’s model family for language, coding and multimodal applications. This profile specifies GPT-5.4 rather than combining capabilities across the family: it accepts text and images and returns text, with configurable reasoning and built-in API tools for workflows beyond a standalone chatbot.
Key features
- Text and image input; text output
- Configurable reasoning effort
- Function calling and structured outputs
- Web search and file search tools
- Responses and Chat Completions APIs
Best for
- Coding assistants
- Document and screenshot analysis
- Tool-connected business assistants
Who it suits
- Application developers
- Teams building document assistants
- Coding-tool builders
Who may not need it
- Teams requiring downloadable model weights
- Projects needing native speech output
Integrations and compatibility
- Responses API
- Chat Completions API
- Batch API
- MCP tools
Where it fits in a workflow
Use GPT-5.4 as the reasoning layer behind retrieval and business tools. Budget for tool calls and long-context premiums rather than treating the headline token rate as the total cost.
Specifications
| Model family | GPT |
|---|---|
| Version these details describe | GPT-5.4 |
| Developer | OpenAI |
| Modalities | text, image |
| Context window | 1,050,000 tokens |
| Output limit | 128,000 tokens |
| Access | API |
Specifications apply to the version named above only and were checked on Oct 26, 2026. Official model documentation.
Sources
Strengths
- Combines reasoning with API tools
- Large context for multi-document tasks
- Supports schema-constrained responses
Watch-outs
- No native audio or video support in this version
- Fine-tuning is not supported
- Prompts above 272K input tokens cost more
Alternatives
Claude (Anthropic)
Anthropic models for long-document reasoning and agentic coding.
Gemini (Google)
Google’s multimodal models for media analysis and tool-connected reasoning.
Llama (Meta)
Downloadable Meta models for controlled, self-hosted multimodal deployments.
Cohere Command
Cohere’s Command models for retrieval-grounded assistants and enterprise tools.
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Listings are editorial and independent. Details that change often are marked “to be verified” until an editor checks them against the official source.