OpenAI Debuts GPT-5.5 'Spud,' Matching Anthropic's Latest AI Leap
OpenAI launched GPT-5.5, codenamed 'Spud,' days after Anthropic released its latest Claude AI.
Why it matters: The accelerated pace of advanced AI releases ramps up the legal tech arms race, potentially shifting standards for legal workflow automation and AI adoption. Firms and developers must closely track these models' capabilities to leverage productivity and ensure compliance.
- OpenAI released GPT-5.5 'Spud' on April 23, 2026, with major advances in coding and workflow automation.
- GPT-5.5 scores 82.7% accuracy on Terminal-Bench 2.0, a leading command-line workflow benchmark.
- Anthropic launched Claude Opus 4.7 on April 16, 2026, and its Mythos Preview AI identified thousands of system vulnerabilities.
- GPT-5.5 performs complex, multi-step tasks more efficiently, using fewer tokens than previous OpenAI models.
OpenAI's unveiling of GPT-5.5 “Spud” on April 23 signals a sharp escalation in the AI model race. The release follows Anthropic’s April 16 launch of Claude Opus 4.7, consolidating the rivalry between major AI labs and promising significant legal tech implications.
- GPT-5.5 builds on OpenAI’s prior work by advancing agentic coding, computer use, and knowledge work, and it is particularly strong in handling early scientific research and multi-step task execution (OpenAI).
- The model sets a new industry watermark on Terminal-Bench 2.0, achieving 82.7% accuracy on complex command-line workflows—a metric relevant to legal workflow automation and document processing.
- OpenAI emphasizes efficiency: GPT-5.5 uses significantly fewer tokens for the same output compared to earlier models (The Information).
- Anthropic’s recent surge includes the Claude Opus 4.7 update and a Mythos Preview that detected thousands of critical zero-day vulnerabilities—spurring collaboration with major technology providers.
OpenAI leaders regard GPT-5.5 as a step toward future computing. “This model is a real step forward towards the kind of computing that we expect in the future — but it is one step, and we expect to see many in the future,” said co-founder Greg Brockman. Technical staff highlight their commitment to safety, with Mia Glaese emphasizing a "durable approach to rolling out models safely."
Legal tech leaders should evaluate these leaps for their impact on workflow automation, case analysis, and compliance assurance. As both OpenAI and Anthropic push the frontiers, model selection and governance become more critical to staying competitive and compliant.
By the numbers:
- 82.7% — GPT-5.5's accuracy on Terminal-Bench 2.0, surpassing prior OpenAI benchmarks.
- 50+ — Organizations collaborating with Anthropic on cybersecurity from Claude Mythos findings.
- Thousands — Zero-day vulnerabilities found by Anthropic's Mythos Preview in major operating systems.
Yes, but: Specific details on GPT-5.5 pricing, user availability, and direct comparative benchmarks to Anthropic’s new models remain undisclosed.