Claude Opus 5.5 delivers Fable 5.1 performance – and costs 40% less
Developers may see faster coding with fewer steps. Anthropic says the upgrade is safer, cheaper, and less wordy. Less than two months after the release of Claude Opus 5, Anthropic is back with Opus 5.5.
- ▪Developers may see faster coding with fewer steps.
- ▪Anthropic says the upgrade is safer, cheaper, and less wordy.
- ▪Less than two months after the release of Claude Opus 5, Anthropic is back with Opus 5.5.
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Record
| Original publisher | ZDNet |
| Canonical URL | https://www.zdnet.com/innovation/anthropic-claude-opus-5-5-fable-5-1-performance-costs-less/ |
| Publication time | 2026-09-22T16:30:05Z |
| Retrieval time | 2026-09-22T16:43:54.022Z |
| Last seen | 2026-09-22T16:43:54.022Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | KyvmGANOd5J_ · 1 stories |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
Innovation > Artificial Intelligence Claude Opus 5.5 delivers Fable 5.1 performance – and costs 40% less Anthropic’s newest Claude model aims to make frontier AI cheaper, faster, and safer, while giving subscribers more breathing room before those frustrating usage limits kick in. David Gewirtz Senior Contributing Editor Computer science professor turned AI innovator David Gewirtz has spent over thirty years driving advancements at the forefront of artificial intelligence and is the recipient of the Sigma Xi Research Award in Engineering.… Read full bio David Gewirtz Senior Contributing Editor Read full bio September 22, 2026, 12:30 pm ET 4 min read Elyse Betters Picaro/ZDNET ZDNET’s key takeaways Claude Opus 5.5 could be a big win for power users.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at ZDNet.
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