--- title: GPT-5.2 API — OpenAI-Compatible LLM via ModelsLab description: Access GPT-5.2 via OpenAI-compatible REST API on ModelsLab. Streaming responses, function calling, large context windows. Free API key for developers. url: https://modelslab.com/gpt-52 canonical: https://modelslab.com/gpt-52 type: website component: Seo/ModelPage generated_at: 2026-07-01T04:01:04.690440Z --- Available now on ModelsLab · Language Model GPT-5.2 API — OpenAI-Compatible LLM Access OpenAI-compatible GPT-5.2 chat completions via REST. Streaming, function calling. --- [Get GPT-5.2 API key](/register) [API documentation](https://docs.modelslab.com) ![GPT-5.2 API — OpenAI-Compatible LLM Access](https://assets.modelslab.ai/generations/2bdd00f4-1692-49d8-a562-72cb1753d0ff.png) Why developers ship with GPT-5.2 --- OpenAI compatible ### Drop-in chat completions endpoint GPT-5.2 is exposed via the OpenAI-compatible /v1/chat/completions surface. Swap the base URL and your existing OpenAI SDK code works unchanged. Streaming ### Token-by-token streaming Stream responses with server-sent events for low-latency UX. Same SSE format as the OpenAI API so client SDKs work without modification. Function calling ### Structured tool use Define functions in the request, and GPT-5.2 returns structured tool calls when appropriate. Supports parallel tool calls and JSON-mode for schema-constrained output. Context window ### Large context for RAG and agents Extended context windows allow long documents, RAG pipelines, and agent loops without aggressive truncation. Suitable for code generation, long-form writing, and document QA. Predictable pricing ### Per-token billing Pay per input + output token. No subscription required, no monthly minimum. Volume pricing kicks in at 100M tokens per month. Multi-modal pipelines ### Combine GPT-5.2 with image, video, audio Use GPT-5.2 to generate prompts for the image-generation API, scripts for the video API, or scripts for voice cloning — all through one ModelsLab API key. Reliability ### Dedicated capacity, no cold starts GPT-5.2 runs on dedicated infrastructure with consistent latency. No cold starts on the first request, and burst capacity for traffic spikes. Compliance ### GDPR and DPA available Prompts and completions processed in compliant regions; not used for training. Signed DPA and dedicated VPC deployments available for enterprise customers. Examples GPT-5.2 use cases --- Copy any prompt below and try it yourself in the [playground](/register). Code Generator “Write a Python Flask API for user authentication with JWT, including database schema in SQLAlchemy, unit tests, and deployment script for Docker. Use best practices for security.” Financial Model “Build a spreadsheet model in CSV format for startup valuation using DCF method. Include assumptions, 5-year projections, sensitivity analysis, and charts described in markdown.” Project Plan “Create a detailed project plan for migrating a monolith app to microservices. Break into phases, assign tasks, estimate timelines, risks, and generate Gantt chart in ASCII.” Document Analysis “Analyze this 50k-token RFP document \[insert text\]. Extract key requirements, propose solution architecture, timeline, and budget in a professional report format.” For Developers A few lines of code. OpenAI-compatible chat completions --- ModelsLab handles the infrastructure: fast inference, auto-scaling, and a developer-friendly API. No GPU management needed. - **Serverless:** scales to zero, scales to millions - **Pay per token,** no minimums - **Python and JavaScript SDKs,** plus REST API [API Documentation ](https://docs.modelslab.com) PythonJavaScriptcURL Copy ``` import requests response = requests.post( "https://modelslab.com/api/v7/llm/chat/completions", json={ "key": "YOUR_API_KEY", "prompt": "", "model_id": "" } ) print(response.json()) ``` FAQ Common questions about GPT-5.2 API — OpenAI-Compatible LLM Access --- [Read the docs ](https://docs.modelslab.com) ### What is the GPT-5.2 API? The GPT-5.2 API is an OpenAI-compatible REST endpoint exposing the GPT-5.2 chat completion model on ModelsLab infrastructure. Use the same SDKs, request format, and tool-calling schema as the official OpenAI API by changing only the base URL. ### How is GPT-5.2 different from GPT-5? GPT-5.2 is a refresh of the GPT-5 family with stronger instruction following, better tool-use accuracy, and updated training data. It is intended as a drop-in upgrade for GPT-5 integrations — same API surface, improved outputs. ### Is the GPT-5.2 API OpenAI-compatible? Yes. The endpoint accepts the same /v1/chat/completions request schema as the OpenAI API. Set base_url to ModelsLab's URL, supply your ModelsLab API key, and existing OpenAI SDK code works unchanged in Python, JavaScript, Go, and other languages. ### Does GPT-5.2 support function calling? Yes. Pass a tools array in the request and GPT-5.2 returns structured tool_calls when appropriate. Parallel tool calls are supported, and the response format is identical to the OpenAI tool-calling spec. ### Does GPT-5.2 support streaming? Yes. Set stream=true in the request body to receive server-sent events. The SSE format is identical to the OpenAI streaming format, so client SDKs that handle OpenAI streaming work without modification. ### What is the context window for GPT-5.2? GPT-5.2 supports extended context windows suitable for RAG pipelines, long-form generation, and multi-turn agent loops. Specific limits are documented in the API reference and may evolve as the underlying model improves. ### How much does the GPT-5.2 API cost? Pricing is per token, billed separately for input and output. No subscription required, no monthly minimum. Volume discounts available for 100M+ tokens per month — contact sales for enterprise pricing. ### Will my prompts be used for training? No. Prompts and completions sent to the GPT-5.2 API on ModelsLab are not used for training. A signed DPA documents the contract terms, and enterprise plans include dedicated VPC deployments for additional isolation. ### Can I use GPT-5.2 alongside image and video APIs? Yes — that is one of the most common patterns. Use GPT-5.2 to generate image prompts, video scripts, or voice cloning text, then call the image, video, or audio endpoints with the same API key on the same dashboard. ### Is the GPT-5.2 API rate-limited? Default rate limits start at 60 requests per minute and scale automatically with usage. Enterprise plans include higher limits or dedicated capacity. Contact sales if you need custom rate-limit terms. Ready to create? --- Start generating with GPT-5.2 API — OpenAI-Compatible LLM Access on ModelsLab. [Get GPT-5.2 API key](/register) [API documentation](https://docs.modelslab.com) --- *This markdown version is optimized for AI agents and LLMs.* **Links:** - [Website](https://modelslab.com) - [API Documentation](https://docs.modelslab.com) - [Blog](https://modelslab.com/blog) --- *Generated by ModelsLab - 2026-07-01*