Windsurf: GPT-5.4 Mini Now Available

GPT-5.4 Mini Arrives in Windsurf

Windsurf expanded its model lineup on March 17, 2026, with the addition of GPT-5.4 Mini — OpenAI's latest compact model and the most capable small model the company has released to date. Available immediately to self-serve users at a promotional rate of 1x credits, GPT-5.4 Mini rounds out the GPT-5.4 family already accessible through Windsurf, giving developers a full cost-performance spectrum for their coding workflows.

Performance That Punches Above Its Weight

GPT-5.4 Mini is positioned as a near-peer to the full GPT-5.4 flagship on the metrics that matter most to developers. On SWE-Bench Pro — the industry benchmark for real-world software engineering tasks — GPT-5.4 Mini scores 54.4%, compared to 57.7% for the full model. That 3.3-point gap is a remarkably small trade-off given the significant difference in speed and cost.

Speed and Multimodal Gains

Beyond coding benchmarks, GPT-5.4 Mini delivers substantial improvements across a broader range of capabilities:

• 2x+ faster than the previous GPT-5 Mini, enabling more responsive interactions and faster agent task completion
• OSWorld-Verified score of 72.1% versus 42.0% for GPT-5 Mini — a dramatic leap in computer-use and multimodal reasoning capability
• Competitive performance on math, science, and instruction-following tasks relative to the full flagship

Pricing and Credit Structure

For Windsurf users, GPT-5.4 Mini is priced at 1x credits under a promotional rate — making it the most cost-accessible OpenAI model currently available on the platform. In the broader OpenAI API ecosystem, the model is priced at $0.75 per million input tokens and $4.50 per million output tokens, substantially undercutting the full flagship while delivering near-equivalent results on the majority of coding tasks.

This positions GPT-5.4 Mini as the go-to choice for:

• High-throughput coding tasks where latency matters
• Cascade subworkflows and background agent pipelines
• Multimodal reasoning tasks involving screenshots or UI interactions
• Cost-conscious teams running large volumes of AI-assisted development

Completing the GPT-5.4 Family in Windsurf

With GPT-5.4 Mini now available, Windsurf offers the full GPT-5.4 tier stack: from 1x-credit Mini tasks at one end to 8x-credit Extra High Reasoning with the full GPT-5.4 at the other. Developers can now select the exact point on the cost-performance curve that fits their use case — whether that is a quick autocomplete, a multi-step refactor, or a deep architectural analysis requiring maximum reasoning depth.