Claude Opus 5.5: Stronger Coding Than Opus 5 for Less

Summary
YouTube tech commentator Eric Tech reviews the release of Anthropic’s Claude Opus 5.5 on September 22, 2026. He breaks down Anthropic's announcement posts, model tiering relative to OpenAI's lineup, Artificial Analysis index scores, and benchmark charts comparing Opus 5.5 against Fable 5.1, Opus 5, and OpenAI models.

What is shown

• [00:00] Title slide and Anthropic announcement post on X detailing the release of Claude Opus 5.5.
• [00:12] Google Trends graph comparing search popularity between gpt 6 and fable 5.1.
• [00:34] Model tier comparison table classifying Ultra Frontier (GPT-6 Astra, Claude Fable 5 / 5.1), Premium Intelligence (GPT-5.6 Sol / GPT-6 Sol, Claude Opus 5 / 5.5), and Balanced Production (GPT-5.6 Terra, Claude Sonnet 5 / 5.5).
• [00:53] X trending list showing topics including "Claude 5.5", "Sol 6", and "Claude Opus 5".
• [01:00] Presenter drafting a YouTube community poll to decide benchmark tests between GPT Sol and Claude Opus 5.5.
• [01:16] Artificial Analysis Intelligence Index bar chart showing Claude Opus 5.5 at 58, ahead of Claude Fable 5.1 (53) and GPT-6 Astra (53).
• [01:28] Official Anthropic benchmark table covering Agentic Coding (Terminal-Bench 4.0, FrontierCode v1.1, CursorBench 4.0), Knowledge work (GDPval-AA v2.1), Business workflows (AutomationBench), Multidisciplinary reasoning (Humanity's Last Exam), Agentic scientific research, Computer use (OSWorld 3.0), and ChartBench.
• [02:00] Performance curves by effort level and cost: Business workflows (AutomationBench), Agentic coding (FrontierCode v1.1), Real-world knowledge tasks (GDPval-AA v2.1), and Agentic terminal coding (Terminal-Bench 4.0).
• [03:36] Side-by-side text generation comparison between Claude Opus 5 and Claude Opus 5.5 diagnosing a code billing bug, illustrating Opus 5.5's more direct communication style.

Claims & numbers

• Release date & pricing: Anthropic states Claude Opus 5.5 was released on September 22, 2026, costs 40% less to run on typical workloads than Opus 5, and generates output more than 30% faster than Opus 5 (the presenter cites Anthropic's post at [00:03] and [02:00]).
• Artificial Analysis Intelligence Index: The index rates Claude Opus 5.5 (max with tools) at 58, Claude Fable 5.1 at 53, GPT-6 Astra at 53, Grok 4.7 at 48, MiniMax-M2.6-Pro at 46, GLM-5.3 at 45, Gemini 3.8 Flash at 41, DeepSeek-V4.1-Flash at 39, and GPT-5.6 Luna at 37 ([01:16]).
• Benchmark scores reported in table ([01:28]):
  • Terminal-Bench 4.0: Opus 5.5: 66.4% | Fable 5.1: 55.8% | Opus 5: 52.3% | GPT-6 Astra: 57.9% | GPT-5.6 Sol: 37.3%
  • FrontierCode v1.1 (Main): Opus 5.5: 54.4% | Fable 5.1: 50.3% | Opus 5: 48.0% | GPT-6 Astra: 53.3% | GPT-5.6 Sol: 47.5%
  • CursorBench 4.0: Opus 5.5: 57.8% | Fable 5.1: 51.8% | Opus 5: 46.6% | GPT-5.6 Sol: 41.7%
  • GDPval-AA v2.1: Opus 5.5: 1846 | Fable 5.1: 1735 | Opus 5: 1708 | GPT-6 Astra: 1542 | GPT-5.6 Sol: 1588
  • AutomationBench: Opus 5.5: 40.0% | Fable 5.1: 31.4% | Opus 5: 26.9% | GPT-6 Astra: 41.4% | GPT-5.6 Sol: 28.8%
  • Humanity's Last Exam: Opus 5.5: 67.7% | Fable 5.1: 65.6% | Opus 5: 63.6% | GPT-6 Astra: 57.2%
  • Terminal-Bench Science 0.7: Opus 5.5: 58.7% | Fable 5.1: 52.6% | Opus 5: 29.0% | GPT-6 Astra: 64.6% | GPT-5.6 Sol: 22.4%
  • OSWorld 3.0 (Computer Use): Opus 5.5: 81.8% | Fable 5.1: 80.7% (partial) | Opus 5: 74.0% (partial)
  • ChartBench: Opus 5.5: 89.0% | Fable 5.1: 88.4% | Opus 5: 83.4%
• Effort scaling: The presenter highlights that in agentic coding on FrontierCode v1.1, Claude Opus 5.5 peaks at a medium effort setting (~55 score), achieving higher intelligence scores than at high or extra-high effort levels ([02:37]–[03:02]).

Notable quotes

• [00:03] "It performs at the level of Claude Fable 5.1 for most tasks, and costs 40% less to run than Opus 5." (reading Anthropic's announcement post)
• [02:00] "At its default effort setting, Opus 5.5 delivers frontier results for a fraction of the cost per task, often beating other models running at their highest settings." (reading Anthropic's post)
• [03:39] "Opus 5.5 communicates more naturally, addressing some of the most common feedback we heard on Opus 5." (reading Anthropic's post)

Assessment
This is a third-party YouTube commentary and overview video reviewing Anthropic's official announcement posts and third-party benchmark data. The creator does not run live hands-on tests in this video, instead walking through published charts and prompting viewers to vote on future tests.

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