GPT-5 mini

GPT-5 mini

Quick answer: GPT-5 mini is OpenAI's cost-efficient tier of the GPT-5 family, released August 7, 2025. It scores 19.44% on Humanity's Last Exam — more than double o3's score (20.32% is comparable) and dramatically above GPT-4o mini — representing a generational leap in small-model capability. Designed to replace GPT-4o mini as the default high-throughput OpenAI model.

At a Glance

Where GPT-5 mini leads

• 19.44% Humanity's Last Exam — frontier-class expert reasoning at the mini tier, comparable to o3 (20.32%)
• GPT-5 training lineage: stronger reasoning, instruction following, and world knowledge than GPT-4o mini
• Cost-efficient: designed for high-volume production pipelines
• Multimodal capability
• Updated knowledge cutoff (June 2025 vs GPT-4o mini's Oct 2023)

Where it lags

• Pricing not yet publicly disclosed at this page's last update — verify current rates
• Lower capability ceiling than GPT-5 and GPT-5.6 Sol
• No extended reasoning mode

Best for: High-throughput pipelines, batch processing, API-integrated agents, and any workflow currently using GPT-4o mini that would benefit from dramatically improved intelligence at similar cost.

What GPT-5 mini Is

GPT-5 mini is the small-model tier of OpenAI's GPT-5 family, the successor to GPT-4o mini. Its 19.44% Humanity's Last Exam score is the most striking headline: GPT-4o mini scored approximately 0% on HLE at launch, making GPT-5 mini a step-change improvement in expert-level reasoning capability at the mini tier.

The model inherits the GPT-5 training approach — which emphasises both broad world knowledge and practical reasoning — at reduced scale and cost. Like GPT-4o mini, it is designed for high-throughput applications where latency and cost-per-request matter.

For teams running GPT-4o mini in production, GPT-5 mini is the natural migration target: it slots into the same cost-tier position while offering dramatically better performance on reasoning-intensive tasks, and has a significantly more recent knowledge cutoff.

Specifications

Pricing

Pricing for GPT-5 mini had not been publicly confirmed at the time of this page's last update. Check the OpenAI pricing page for current rates.

Public Benchmark Scores

GPT-5 mini vs Alternatives

GPT-5 mini's HLE score places it within 1 point of o3 (20.32%) — remarkable for a mini-tier model. This suggests that at the GPT-5 generation, the capability gap between cost-tier and premium models has narrowed substantially.

Related Models & Benchmarks

• Compare: GPT-4o mini · GPT-5 · o4-mini · Gemini 2.5 Flash
• Benchmarks: Humanity's Last Exam

Frequently Asked Questions

Specs and scores sourced from OpenAI's official GPT-5 mini announcement (August 2025) and Benchgen evaluations. Pricing cited to the OpenAI pricing page. Last updated 2026-07-24.