gpt-4.1

gpt-4.1

by OpenAI LLC
3.0
Visit Website
LinkedIn X (Twitter) YouTube

Pros & Cons

Pros

  • Very Large Context Window: Up to 1 million tokens allowed entire contracts, discovery sets, or case files to be processed in a single prompt.
  • Strong Instruction Following: Handled complex formatting and multi-step drafting instructions more reliably than its predecessor, GPT-4o.
  • Lower Cost Than GPT-4o: Offered similar or better performance at roughly 26% lower cost, useful for high-volume document processing.

Cons

  • Retired From ChatGPT: No longer selectable in ChatGPT as of February 13, 2026, and deprecated across GitHub Copilot as of June 1, 2026.
  • No Legal-Specific Training: Lacks case-law grounding, jurisdiction-specific knowledge, and citation verification found in dedicated legal AI products.
  • Dated Knowledge Cutoff: Its June 2024 knowledge cutoff is a known limitation OpenAI cites as a reason to migrate to GPT-5.1 or GPT-5-Codex.

About gpt-4.1

Introduction

GPT-4.1 is OpenAI's general-purpose model released April 14, 2025, notable for a 1-million-token context window (roughly 750,000 words, an eight-fold increase over GPT-4o) and improved instruction-following and coding at 26% lower cost than GPT-4o. Like other general-purpose OpenAI models, it was not trained specifically on legal data, so it lacks jurisdiction-specific statutory and case-law grounding compared with purpose-built legal AI tools, though its large context window made it well suited to processing long documents.

2026 Status: Being Retired

GPT-4.1 is being wound down across OpenAI's products. It was retired from ChatGPT on February 13, 2026 (existing chat history remains viewable, but the model can no longer be selected), and it was deprecated across all GitHub Copilot experiences on June 1, 2026. OpenAI's recommended successors are GPT-5.1 for general use and GPT-5-Codex for coding-heavy work, both of which also resolve GPT-4.1's dated (June 2024) knowledge cutoff. Any legal workflow still built on GPT-4.1 via the API should plan a migration.

Use in Legal Work

GPT-4.1's long context window made it genuinely useful for summarizing lengthy contracts, discovery documents, or entire matter files in one pass, and its improved instruction-following helped with formatting-heavy drafting tasks. It never had native legal-database access, built-in citation verification, or legal-specific fine-tuning, so substantive legal analysis always required review by a qualified professional — and with the model now retired from ChatGPT and being phased out elsewhere, it is no longer a sound basis for new legal-AI tooling.

Frequently Asked Questions

It was retired from ChatGPT on February 13, 2026, and deprecated across GitHub Copilot on June 1, 2026. OpenAI's recommended successors are GPT-5.1 (general use) and GPT-5-Codex (coding). Teams should confirm current API availability directly with OpenAI before building new workflows on GPT-4.1.

Its 1-million-token context window made it one of the more capable general-purpose models for summarizing or cross-referencing very long contracts or discovery sets in a single pass, though it still lacked legal-database grounding and required lawyer review of any substantive analysis.

Reviews