The AI Daily Brief: Artificial Intelligence News and Analysis

What I Learned Testing GPT-5.5

April 24, 2026

AI Summary

5 min read

OpenAI released GPT-5.5 on Friday, positioning it as a knowledge work model for agents that handles complex goals, tools, and task completion in areas like writing, coding, research, data analysis, and software operation. The episode reviews benchmarks, early reactions comparing it to Anthropic's unreleased Mythos and Claude Opus 4.7, independent tests, and the host's hands-on evaluations in Codex, amid high expectations fueled by competition.

Benchmarks and Capabilities

GPT-5.5 leads Artificial Analysis's Intelligence Index, topping it by three points over Anthropic and Google, with its extra-high version first to hit the 60s overall. It excels on agent benchmarks like Terminal Bench 2.0 (82.7% vs. Opus 4.7's 69.4%) and Real-World Hask GDP Val (84.9% vs. 80.3%), plus OS World Verified, BrowserComp, and CyberGym. However, it trails Opus 4.7 on Vending Bench (similar to Opus 4.6), Vals AI professional tasks (finance, medical, legal), and notably SuiBench Pro for coding, which OpenAI dismisses as unrepresentative of frontier capabilities due to memorization issues.

Continue reading the full summary in the app — free to try.

Read Full Summary →

Free • No credit card required

Listen to Audio Summary Open in App

What you'll learn

1 (00:00) **GPT-5.5 Release Intro** - Hype around OpenAI's new model, context of competition with Anthropic's unreleased Mythos
2 (02:44) **Announcement Highlights** - GPT-5.5 positioned as knowledge work agent model for complex goals, tools, and task completion
3 (03:17) **Benchmark Wins** - Tops charts like TerminalBench 2.0 (82.7%), Hask GDP Val, Artificial Analysis Index
4 (04:03) **Mixed Benchmark Results** - Lags on VendingBench, Val's AI pro tasks, SuiBench Pro (debated as non-representative)
5 (05:38) **Cost and Efficiency Debate** - $5/$30 per million tokens in/out, double GPT-5.4 cost but dominates cost-performance frontier
6 (06:34) **Initial Reactions** - Mostly positive vibes checks, seen as new standard despite some hype skepticism
7 (09:00) **Every & Vibe Check Review** - GPT-5.5 as top senior engineer model, faster/easier than Opus 4.7 for pro work

+ Full timestamped outline available in the app

Show Notes

GPT 5.5 is here, and the first reactions are split between benchmark dominance, coding debates, Anthropic comparisons, and questions about whether the upgrade will feel dramatic to everyday users. NLW breaks down the launch, the “real work” positioning, the Mythos backdrop, and what changed in OpenAI’s communication strategy, then shares what he learned testing GPT 5.5 across writing, coding, strategy, design, spreadsheets, and data analysis.

AI Practitioner's Credential Survey - ⁠⁠⁠⁠https://tally.so/r/vGOLr4⁠⁠⁠⁠

Brought to you by:

Granola - The AI notepad for people in back-to-back meetings. 100% off your first 3 months with code AIDAILY at ⁠⁠⁠⁠⁠⁠⁠⁠http://granola.ai/aidaily⁠⁠⁠⁠⁠⁠⁠⁠

Mercury - Modern banking for business and now personal accounts. Learn more at ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠https://mercury.com/personal-banking⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠

Zenflow Work - Agents for knowledge work - ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠https://zenflow.free/⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠

Drata - The agentic trust management platform - ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠https://drata.com/⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠

Blitzy - Want to accelerate enterprise software development velocity by 5x? ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠https://blitzy.com/⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠