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GPT-5.4 Mini

by OpenAI · Released March 2026

A smaller, faster, and more affordable variant of GPT-5.4. Retains the 1M context window and most capabilities at a fraction of the cost. Ideal for high-volume applications where speed and cost matter.

LLM Chat

GPT-5.4 Mini

Powered by OpenAI · Transformer (proprietary, distilled)

Context Window

1M

Parameters

Undisclosed

Max Output

16K

Category

LLM Chat

Overview

GPT-5.4 Mini is a distilled variant of GPT-5.4, designed for high-volume production workloads where speed and cost are critical. Despite being significantly smaller, it retains the 1M token context window — a remarkable engineering achievement that allows it to process massive documents and codebases at a fraction of the cost of its larger siblings.

The model is optimized for fast inference, making it suitable for real-time chat applications, content summarization, classification tasks, and any workflow where low latency matters. At $1.00/M input and $6.00/M output, it offers 6x cheaper output tokens compared to GPT-5.4, making it the go-to choice for cost-sensitive deployments that still need strong general capabilities.

GPT-5.4 Mini maintains good performance on standard benchmarks while trading some capability on the most complex reasoning tasks. It excels at straightforward tasks like summarization, extraction, classification, and conversational AI where the full power of GPT-5.4 or Pro is unnecessary.

Pricing

MetricPrice
Input /1M tokens₹100.0000
Output /1M tokens₹600.0000

1 credit = ₹1 = $0.01 USD. Prices shown from provider; CallMissed passes through with ~35% markup.

Key Highlights

  • 6x cheaper than GPT-5.4 on output tokens
  • 1M token context window retained
  • Fast inference for real-time applications
  • Strong performance on standard benchmarks

Benchmarks

BenchmarkScore
MMLU-Pro80.1%
HumanEval88.5%
MATH-50088.7%
GPQA Diamond68.2%
SWE-bench Verified58.3%

Technical Details

  • Distilled from GPT-5.4 — retains core capabilities at smaller size
  • Context window: 1,000,000 tokens retained from full GPT-5.4
  • Optimized for fast inference and low latency
  • 6x cheaper output tokens compared to GPT-5.4
  • Supports structured outputs, function calling, and JSON mode
  • Post-trained with RLHF for instruction following
  • Available via OpenAI API and CallMissed unified gateway

Strengths

  • 6x cheaper than GPT-5.4 while retaining the 1M context window
  • Fast inference optimized for real-time and high-volume workloads
  • Strong general-purpose performance for straightforward tasks
  • Good balance of cost, speed, and capability for production deployments

Limitations

  • Reduced performance on complex reasoning compared to GPT-5.4 and Pro
  • Less capable at multi-step agentic tasks requiring deep planning
  • Proprietary — no self-hosting or fine-tuning options

Use Cases

High-volume chatContent summarizationClassification tasksReal-time applications

API Example

curl https://api.callmissed.com/v1/chat/completions \
  -H "Authorization: Bearer cm_YOUR_KEY" \
  -d '{"model": "openai/gpt-5.4-mini", "messages": [{"role": "user", "content": "Summarize this article"}]}'

Endpoint: POST /v1/chat/completions · Model ID: openai/gpt-5.4-mini

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