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Claude

Anthropic's AI assistant — Fable 5.1, Opus 5 and Sonnet 5 — with best-in-class writing, code review, a 1M-token context and Claude Code.

4.8

Facts checked September 8, 2026

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About Claude

Claude is Anthropic's AI assistant, built with a focus on safety, reasoning, and nuanced writing. The September 2026 lineup: Claude Fable 5.1 at the frontier (September 1, $10/$50 per million tokens), Claude Opus 5 as the flagship workhorse (July, $5/$25), Claude Sonnet 5 as the everyday default ($3/$15) and Claude Haiku 4.5 for fast, cheap tasks ($1/$5), all with a 1M-token context and up to 128K output. Particularly strong on coding, careful analysis of long documents, and writing that does not sound AI-generated. Plans as published on claude.com/pricing (September 8, 2026): Free includes Sonnet and Haiku; Pro ($20/month, $17 annual) adds Opus, limited Fable access, Claude Code, Cowork, Design and unlimited projects; Max from $100/month for 5× or 20× usage; Team from $20 per seat; Enterprise $20 per seat plus usage. Best for: complex reasoning, code review, technical writing, and tasks where you need the AI to acknowledge uncertainty rather than confidently hallucinate.

Reviews (3)

Claude Opus 5 Review: Smartest, and Most Annoying

4.3

Opus 5 tops the Artificial Analysis Intelligence Index at 61 and posted a near-4x jump on ARC-AGI-3, all at the same price as Opus 4.8. Then the reviewers who tested it called it 'brilliant but annoying': it argues with instructions, stops early, does unrequested refactors, and breaks prompt scaffolding tuned for Opus 4.8. One more finding deserves attention — a reported jump in its hallucination rate.

Pros:

+Ranked first on the Artificial Analysis Intelligence Index at 61
+ARC-AGI-3 leap to 30.2% from a 7.8% prior best
+Within 0.5% of Fable 5 on CursorBench at half the cost

Cons:

-Argues with instructions and stops before finishing work
-Reported hallucination rate up 14 points to 50%
-Verbose by default — confirmed in Anthropic's own docs

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Claude Fable 5 Review: Most Capable, at a Premium

4.6

Anthropic's Claude Fable 5 is the most capable model the public can use today — topping SWE-Bench Pro and excelling at vision and long tasks. It is also the priciest major model and ships with hard safety guardrails. Our first-look verdict.

Pros:

+Best agentic-coding result to date (80.3 on SWE-Bench Pro)
+State-of-the-art vision plus stronger long-horizon autonomy
+Mythos-class capability finally available to everyone

Cons:

-Most expensive major model at $10 in / $50 out per million tokens
-Safety classifiers can block legitimate security research
-Mandatory 30-day retention even on zero-retention plans

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Claude Review 2026: Plans, Models and Verdict

4.8

Anthropic turned the lineup over again: Fable 5.1 replaced Fable 5 at the top on September 1, Opus 5 replaced Opus 4.8 at the same price, and Sonnet 5’s intro pricing has ended. Where Claude leads, where it still struggles, and whether Pro and Max are worth it in September 2026.

Pros:

+Best-in-class nuanced writing
+Fable 5.1 leads long-horizon agentic coding (55.8% Terminal-Bench 4.0)
+Opus 5 tops the Artificial Analysis index at Opus 4.8’s price

Cons:

-Fable 5.1 is the most expensive frontier model per task ($10/$50 list and heavy token use)
-Opus 5 argues with instructions and needs prompt re-tuning
-Hard safety guardrails still block some legitimate cyber/bio work

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