Claude Opus 5.5 Review: Why It's My New Claude Code Default

Summary
A creator reviews Anthropic’s newly released Claude Opus 5.5 model, assessing its benchmark numbers, pricing structure, and recommended reasoning effort levels. He showcases community creations alongside two functional browser applications he generated with single prompts: an interactive runner platformer game and a reactive audio visualizer.

What is shown

• [00:43] Breakdown of Opus 5.5 pricing updates and comparative benchmark charts against Claude Fable 5.1 and OpenAI models.
• [01:21] Review of Anthropic’s official release notes detailing speed enhancements, cache pricing, and natural communication formatting.
• [02:14] Comparison table across multiple benchmarks, including Terminal-Bench 4.0, GDPval-AA, FrontierCode v1.1, and AutomationBench.
• [03:27] Evaluation of reasoning effort levels (Low to Max) using FrontierCode data, illustrating diminishing returns on "Max" effort.
• [04:00] Showcase of community-built projects, including a 3D Roblox fighting arena, a Minecraft-style voxel clone, and procedural web layouts.
• [04:36] Gameplay walkthrough of "Sundown Courier," a 2D momentum-based platformer coded from a single prompt in 20 minutes, including custom physics, collision logic, and automated test scripts.
• [05:47] Full demonstration of "Afterglow," a browser audio visualizer featuring multiple customizable rendering shaders (Halo, Ridgelines, Nebula, Particles, Scope) generated from one prompt in two hours.
• [06:44] Walkthrough of the presenter's coding workflow configuration in Claude Code, comparing token costs between Opus 5.5, Fable 5.1, and smaller models.

Claims & numbers

• The presenter says Claude Opus 5.5 costs 40% less to run than Opus 5 overall, with standard token pricing dropping 20% from $5/$25 to $4/$20 per million input/output tokens.
• The presenter states prompt cache reads dropped 60%, from $0.50 to $0.20 per million tokens, and generation speed increased by more than 30% over Opus 5.
• On Terminal-Bench 4.0, the presenter cites Opus 5.5 scoring 66.4% compared to Fable 5.1 (55.8%) and GPT-6 Astra (57.9%).
• On FrontierCode v1.1, the presenter notes Opus 5.5 on "Medium" effort achieved 54.6% at $0.80 per task, outperforming the same model on "Max" effort (54.4% at $6.19 per task) and Fable 5.1 on "Max" (50.3% at $12.83).
• The presenter states that OpenAI’s GPT-6 Luna input tokens cost $0.10 per million, whereas Anthropic's Claude Haiku 4.5 costs $1.00 per million.

Notable quotes

• [03:48] "That's the same result for almost eight times the price."
• [06:44] "Opus 5.5 is now my default on Claude Code."
• [07:43] "If you code or do business work with Claude: yes, definitely switch today, right now, try it out."

Assessment
This is an authentic third-party review featuring live, interactive demonstrations of code generated by Claude Opus 5.5. The demonstrated game and audio visualizer are real and functional, though direct head-to-head output comparisons with GPT-6 Sol and Luna are previewed for a follow-up video rather than evaluated in depth here.

Described by gemini-3.8-flash on 2026-09-29 from the video's audio and frames.