MyCaptionAI
Introducing GPT-5.4 (and Pro, Mini, Nano)OpenAIReleased March 5, 2026

GPT-5.4 (and Pro, Mini, Nano)

First OpenAI model family introducing a 1.05-million-token context window with configurable reasoning effort and affordable pricing.

reasoning-llmProprietary API$2.50 / 1M tok (1.05M Context)Context: 1.05M (1,050,000 tokens)Arena ELO: 1475
Official Model Card & DocsTry in AI Studio / PlaygroundGitHub Repository

Technical Specifications

Architecture Type
Megacontext Reasoning Transformer (1.05M)
Total Parameters
Frontier Scale
Context Window
1.05M (1,050,000 tokens)
Max Output Tokens
128K (128,000 tokens)
Knowledge Cutoff
August 2025
Supported Modalities
text, code, vision, reasoning
License & Access
OpenAI Business Terms

Benchmark Evaluations

Math500
97.8
Mmlu Pro
88.1
Humaneval
98.2
Needle 1m
99.8
Chatbot Arena ELO
1475

Deep Architectural Overview

GPT-5.4 brought 1.05M token long-context mastery to OpenAI’s primary line. Spanning full, Pro, Mini, and Nano editions, it ingests multi-gigabyte code repositories and complete corporate document archives in a single prompt.

Strengths & Considerations

Core Strengths
  • 1,050,000 token context window
  • 128,000 max single-response output tokens
  • 99.8% needle retrieval across 1M tokens
Known Limitations
  • High input prompt sizes (>272k tokens) carry tiered billing

Token & API Pricing

Input Tokens (1M)$2.50
Output Tokens (1M)$15.00
Cached Input (1M)$0.2500
Pricing is verified directly against OpenAI's developer documentation and API rate sheets.

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