gpt-4-0125-preview

Technical Specifications of gpt-4-0125-preview

What is gpt-4-0125-preview?

gpt-4-0125-preview is OpenAI’s January 25, 2024 preview snapshot of GPT-4 Turbo, exposed as a text-only API model with a 128K context window and positioned as an older fast GPT model. OpenAI describes it as a research preview and associates it with the GPT-4 Turbo Preview line rather than the newer GPT-4.1 or GPT-4o families. According to OpenAI’s model documentation, it supports text input and text output, has a December 1, 2023 knowledge cutoff, and allows up to 4,096 output tokens.

The January 2024 update was introduced as an improved GPT-4 Turbo preview intended to complete tasks, especially code-generation tasks, more thoroughly than the earlier preview version. OpenAI’s release messaging around this snapshot emphasized reducing cases of so-called “laziness,” where the model might otherwise stop short of fully carrying out a request.

For CometAPI users, the important distinction is that gpt-4-0125-preview is the platform identifier you should pass when you specifically want this legacy GPT-4 Turbo preview behavior. Even though OpenAI now labels the snapshot as deprecated, it remains a recognizable historical model version with well-known characteristics: long context, strong general reasoning for its generation, and compatibility with traditional chat-style text workflows.

Main features of gpt-4-0125-preview

• 128K context window: Supports very large prompts and long multi-turn conversations, making it suitable for summarization, document analysis, code review, and other context-heavy text tasks.
• Improved task completion versus earlier preview builds: The January 25, 2024 snapshot was released specifically to improve thoroughness, especially for code generation and other tasks where prior previews could respond incompletely.
• Text-only operation: This model is designed for text input and text output only; OpenAI lists image, audio, and video as not supported for this snapshot.
• Large-scale prompt handling: With its long context window and GPT-4 Turbo lineage, it fits workflows that need instruction-heavy prompting, large reference materials, or multi-part reasoning over long inputs.
• API compatibility across common text endpoints: OpenAI lists it under standard API surfaces such as Chat Completions, Responses, Assistants, and Batch, which made it easy to integrate into existing application pipelines built around OpenAI-style request formats.
• Known legacy snapshot behavior: Because it is a dated preview snapshot, some teams prefer it when they need reproducibility tied to a specific GPT-4 Turbo-era model version rather than a moving alias. OpenAI explicitly lists gpt-4-0125-preview among GPT-4 Turbo Preview snapshots/aliases. This is partly an inference from snapshot-based versioning behavior, supported by OpenAI’s model page.
• Deprecated upstream status: OpenAI now marks gpt-4-0125-preview as deprecated, so it is best treated as a legacy compatibility option rather than a future-facing default.

How to access and integrate gpt-4-0125-preview

Step 1: Sign Up for API Key

To get started, create an account on CometAPI and generate your API key from the dashboard. Once you have the key, store it securely and use it in the Authorization header for all requests. CometAPI provides an OpenAI-compatible API surface, so the integration pattern is straightforward for teams already using standard chat completion workflows.

Step 2: Send Requests to gpt-4-0125-preview API

Use CometAPI’s OpenAI-compatible endpoint and specify gpt-4-0125-preview as the model value.

curl https://api.cometapi.com/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_COMETAPI_KEY" \
  -d '{
    "model": "gpt-4-0125-preview",
    "messages": [
      {
        "role": "user",
        "content": "Write a concise summary of the benefits of long-context language models."
      }
    ]
  }'

Step 3: Retrieve and Verify Results

The API returns a standard chat completion response. Read the generated content from the first choice, then validate the output for correctness, completeness, and formatting before using it in production. If your workflow depends on stable behavior, run prompt-level tests and compare results regularly, especially because gpt-4-0125-preview is a legacy preview model identifier with deprecated upstream status.