😺 LIVE NOW: GPT 5.5 (The Spud Model??) Just Dropped. Let's Break It.

2026-04-22 · Source: The Neuron · Field: Technology & Digital — Artificial Intelligence & Machine Learning, Emerging Technologies & Innovation · Depth: Intermediate, quick

Summary

OpenAI released GPT-5.5, codenamed "Spud," on April 23, 2026, positioning it as a "worker model" designed to complete tasks rather than just chat. This new model achieved an 82.7% score on Terminal-Bench 2.0 and an 84.9% wins-or-ties rate against industry professionals on GDPval, OpenAI's benchmark for real knowledge work across 44 occupations. The release occurred one week after Anthropic launched Claude Opus 4.7, intensifying competition in the AI model landscape. GPT-5.5 Pro is priced at $30 per million tokens for input and $180 per million tokens for output, which is six times the cost of GPT-5.4. The Neuron team conducted a live podcast to analyze GPT-5.5's features, compare it with Anthropic's offerings, and discuss its value proposition.

Key takeaway

For AI Engineers evaluating new large language models for integration into professional workflows, you should carefully assess GPT-5.5's benchmark performance on Terminal-Bench 2.0 and GDPval. Consider its "worker model" paradigm and compare its $30/$180 per million token pricing against alternatives like Claude Opus 4.7 to determine cost-effectiveness for specific knowledge work applications, especially given the significant price difference from GPT-5.4.

Key insights

GPT-5.5 is a new "worker model" from OpenAI, excelling in knowledge work benchmarks with competitive pricing.

Principles

• AI models are evolving towards task completion.
• Benchmarks like Terminal-Bench and GDPval quantify real-world AI performance.

In practice

• Evaluate GPT-5.5's performance on Terminal-Bench 2.0.
• Compare GPT-5.5 Pro's pricing against GPT-5.4 and Claude Opus 4.7.

Topics

• GPT-5.5
• OpenAI
• Anthropic Claude Opus 4.7
• Worker Models
• AI Benchmarking

Best for: CTO, VP of Engineering/Data, AI Engineer, AI Scientist, Director of AI/ML, AI Product Manager

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• OpenAI's 'Spud' dethrones Claude on the frontier — OpenAI's GPT-5.5 'Spud' reclaims AI leadership with superior benchmarks and efficiency, amidst geopolitical tensions and job displacement concerns.
• GPT-5.5 tops benchmarks but still hallucinates frequently and costs 20 percent more over the API — GPT-5.5 leads benchmarks and offers better price-performance but struggles significantly with high hallucination rates.
• GPT 5.2: OpenAI Strikes Back — AI benchmark performance is increasingly driven by "thinking time" or test-time compute, complicating direct model comparisons.
• OpenAI’s GPT-5.5 is now live — GPT-5.5 enhances AI capabilities for complex, multi-part tasks with improved efficiency and safety features.
• GPT 5.5 vs Claude Opus 4.7 — Benchmarks offer controlled performance metrics, but real-world AI effectiveness depends on handling unstructured, unclear tasks.

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Editorial summary, takeaway, and curation by AIssential. Original article published by The Neuron.