Multimodal conversational model for code modifications and long-document analysis
GPT-4.1 is OpenAI's multimodal conversational model for developer applications, with key improvements in code modification, complex instruction following, and long-context understanding. It is suitable for locating issues across multiple files, generating patches in specified formats, and extracting and linking information from large volumes of material. Through this platform, it can be used for multimodal analysis, structured output, and multi-turn business conversations.
import os
from openai import OpenAI
client = OpenAI(
api_key=os.environ["ACEDATACLOUD_API_KEY"],
base_url="https://api.acedata.cloud/v1",
)
response = client.responses.create(
model="gpt-4.1",
input="Hello!",
)
print(response.output_text)
Choose an available protocol for this model. OpenAI SDK uses a Base URL ending in /v1; Anthropic SDK uses the root URL. See each guide for protocol-specific parameters, tools and response formats.
Specifications and API features
Clarify capacity, input and output, and invocation methods before selecting a model.
Native context
Official native specification: 1,047,576 tokens
Native maximum output
Official native specification: 32,768 tokens
Knowledge cutoff
June 2024
Input and delivery
Text and image input; text responses, code, and analysis results
Structured output options
Chat Completions provides text, json_object, and json_schema settings
Tool integration
Function calling, tool selection, and tool result feedback
Interaction methods
Standard text or streaming text; message history is organized by the application according to the selected protocol
Context and maximum output are publicly available native specifications; actual request limits and interaction methods are determined by the selected endpoint and its operational constraints.
Core Capabilities
Learn what gpt-4.1 can bring to your work.
Modify Code Around Issues
GPT-4.1's programming strengths go beyond generating code: they also include modifying files in diff format, following tool-use requirements, and reducing changes unrelated to the task. After providing an issue description, relevant code, and acceptance criteria, you can ask it to produce targeted patches and explain the changes, making it easier to integrate into existing review workflows.
Turn Complex Requirements into Consistent Formats
It is suitable for tasks that simultaneously include formats, steps, prohibitions, and required content, and it can also continue answering based on requirements from previous conversations. Prompts should clearly specify priorities, field meanings, and how to handle missing information, so it can complete extraction, classification, or responses according to specific rules rather than guessing business intent on its own.
Connect Text and Visual Information Across Materials
Its long-context capability is well suited to analyzing related code, business rules, and documents within the same task, finding scattered details and explaining their relationships. Image understanding can be used for questions about charts, diagrams, and interface screenshots, delivering analytical conclusions combined with textual requirements rather than merely generating generic image descriptions.
Applicable Scenarios
Start with specific tasks to find where the model can be effective.
Bug Fixing and Change Review
Provide error messages, relevant source files, interface constraints, and existing tests, and let GPT-4.1 identify possible causes, generate patches, and list regression checkpoints. For review tasks, you can require it to output issues, impacts, and recommendations by severity, ultimately delivering a reviewable change plan before tests are run in the engineering environment.
Comparing Terms Across Multiple Documents
Organize contracts, supplemental agreements, or policy materials into text with titles and paragraph numbers, and ask the model to extract obligations, terms, and exceptions, then compare the relationships among different materials. Deliver a terms comparison table and items requiring confirmation; retain original-text location information so reviewers can trace and verify conclusions item by item.
Screenshot-Driven Business Explanations
Submit screenshots of reports or product interfaces along with metric definitions, business context, and specific questions, and let the model explain chart changes or organize interface issues. You can require it to output a summary, supporting observations, and follow-up checks; when text is too small or charts are dense, first provide clear close-up images before conducting a comprehensive analysis.
How to choose this model
Choose based on task complexity, input materials, and expected results.
Prioritize the main model for code and long materials
Compared with GPT-4o, GPT-4.1 has clear improvements in code diffs, following complex instructions, and using long context. Consider it first when you need to modify large files, connect multiple materials, or strictly control response content. When migrating existing GPT-4o applications, use the same batch of real tasks to compare patch quality and rule adherence, rather than only judging whether responses are fluent.
Distinguish mini and nano by task complexity
GPT-4.1, mini, and nano are different models, and should not be considered equally effective simply because they belong to the same series. For multi-file code changes and complex material analysis, evaluate the main model first; for lighter extraction and conversation tasks, compare mini; for low-latency tasks such as classification and autocomplete, consider nano, then weigh actual quality and invocation cost.
Start with a specific task
Based on the characteristics of gpt-4.1, first validate a small task whose results can be checked.
01
Generate code diffs under explicit constraints
You can ask directly: Fix this defect according to the existing code style, changing only files related to the reproduction path. Output the reason for the changes, the code diff, and boundary test suggestions, while preserving external interfaces.
02
Prepare input that supports sound judgment
Include adjacent modules and project conventions; check the patch scope, compilation results, and whether all constraints are followed.
03
Then integrate it into your workflow
Use the full model ID gpt-4.1, first confirm the public request format and available parameters on the API page, then connect your application. Preserve result parsing, exception handling, and relevant evidence, and use the same set of real samples to evaluate whether it is suitable for continued use.
Usage boundaries
Before formal use, understand the output quality and capability scope.
Long context does not mean that all details can be retained without error. Similar clauses, repeated requests, and cross-file dependencies increase disambiguation difficulty. It is recommended to number the materials and require answers to cite the original basis; important conclusions should be verified separately rather than accepting a single comprehensive judgment.
GPT-4.1 is more inclined to follow instructions literally. Vague requirements or conflicting rules may cause results to deviate from expectations. Clearly specify which files may be modified, what content must not be added, how missing information should be handled, and provide examples and acceptance criteria for the output format.
Image understanding is for analyzing images, not the same as image generation or speech generation; code and function-call results also do not mean actual execution has been completed. Deployment, testing, and data writing require supporting tools and authorization, while up-to-date facts require updated materials or integration with a retrieval workflow.
Frequently asked questions
Answers to common questions when using gpt-4.1.
Can GPT-4.1 analyze images directly?
It can perform image and text understanding. When using Chat Completions, combine text and image_url content blocks in the same message, and specify the charts, areas, or issues to inspect. Results are returned as text analysis; if you need to generate or edit images, choose a dedicated image model.
Does 1 million tokens of context mean it can generate an equally long answer?
No. Context capacity and the per-response output limit are different metrics: GPT-4.1 has a native context window of up to 1 million tokens, with a maximum output of 32,768 tokens. Long-form deliverables can be generated by chapter, with space reserved for input materials, conversation history, and responses.
Should I use Responses or Chat Completions?
Applications that already use message arrays can use Chat Completions, submitting model and messages and reading the response from choices. Responses uses model and input, and handles output according to response events. The data structures of the two interfaces differ, so request bodies or parsing logic should not be mixed directly.
How does GPT-4.1 maintain multi-turn conversations?
When using Chat Completions, put relevant history into messages; when using Responses, organize input and related conversation content according to the documentation. Provide the latest materials, revision goals, and key constraints each turn; for longer tasks, retain interim summaries and a final version that can be checked independently.
How can I make GPT-4.1 output processable JSON?
Chat Completions provides json_object and json_schema format settings. It is recommended to clearly specify field meanings, required fields, and rules for missing values, and perform structural and business validation on the receiving end. Valid JSON only means the format can be parsed; it does not mean amounts, classifications, or cited content are necessarily correct.