Anthropic Ships Opus 5, Pitches Half-Price Rival to Fable 5
TL;DR
- Opus 5 scores higher than Fable 5 on 8 of 13 benchmarks at half the input cost, making cost-performance parity the new competitive baseline.
- ARC-AGI-3 score is three times the next-best model, giving Anthropic a single outsized reasoning anchor that benchmarks alone cannot rebut.
- A zero on Anthropic's internal vulnerability-exploitation benchmark directly targets the enterprise security objection blocking agentic deployment.
Anthropic put a new flagship on the shelf today with an unusually pointed pricing message. In its announcement, the company calls Claude Opus 5 a model that "comes close to the frontier intelligence of Claude Fable 5 at half the price," while keeping the list price at $5 per million input tokens and $25 per million output tokens, the same as Opus 4.8.
The pitch, in other words, is a free capability upgrade for anyone already on Opus 4.8 and a cheaper substitute for Fable 5 at the top tier. Anthropic's own numbers back this in places. It says Opus 5 "more than doubles Opus 4.8's performance at a lower cost per task," and gains 10.2 percentage points over Opus 4.8 on an internal organic-chemistry benchmark. The launch post also lines up curated quotes from Scott Wu at Devin, Sualeh Asif at Cursor, and Wade Foster at Zapier, each landing on the same "near-Fable performance at Opus cost" beat.
The safety framing gets its own moment. Opus 5 scores 2.3 on Anthropic's overall misaligned-behavior audit, described as the lowest of any recent Anthropic model, and Anthropic expects its cyber-safety classifiers to intervene "around 85% less often than they do for Fable 5." Both are Anthropic's own measurements on Anthropic's own audits, so read them as a directional signal rather than an independently replicated result.
Every benchmark cited here is either internal to Anthropic or run by paying customers quoted in the same launch post. Independent evaluators have not published head-to-head numbers yet, and the "half the price of Fable 5" line depends on how Fable 5's own list pricing is being compared. Anthropic has not shown how Opus 5 stacks up on the hardest cybersecurity and biology tasks, which is where regulated buyers will actually stress-test it.
If the pricing claim survives third-party evaluation, though, the interesting move is not at Anthropic. It is at everyone shipping agents on top. Devin, Cursor, and Zapier just got a cheaper knob to turn on per-task cost, and the frontier tier's price floor moved with them.
What others are reporting
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Bloomberg Read →
Business and workplace framing: positions Opus 5 as Anthropic's bid to own everyday office AI ahead of its 2026 IPO.
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CNBC Read →
Ties the launch to Anthropic's IPO window with analyst commentary; frames the price cut as a competitive move against OpenAI and Chinese models.
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SiliconANGLE Read →
Deepest technical breakdown across 13 benchmarks; leads with safety credentials and includes concrete enterprise use-case examples for output verification.
Opus 5 scored zero on an internal Anthropic benchmark that evaluates LLMs' ability to exploit vulnerabilities.
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The Next Web Read →
Contextualizes Opus 5 within Anthropic's four-model-in-eight-weeks sprint; frames tiered pricing as deliberate market segmentation, not just cost-cutting.
Opus 5 fills the gap between the expensive Fable tier and the budget-friendly Sonnet tier, offering near-frontier intelligence.
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Yahoo Finance Read →
IPO and regulatory framing: connects Opus 5 pricing to Anthropic's position vs. OpenAI and Chinese models operating under US export controls.
Opus 5 approaches Fable 5's competencies at half the cost.
Shared on Bluesky by 9 AI experts (top 5 by trust)
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Nathan Lambert @natolambert.bsky.social
Insane numbers for opus 5, the power of faster iteration speed + scaled RL (Fable too big to RL as well, yet). And on safeguards "Based on our testing, we expect the classifiers to intervene around 85% less often than th…
View on Bluesky → -
This is giving strong OpenAI-hacksidentally-pwned-Hugging-Face shade: “[Opus 5 is] the safest model yet in terms of avoiding reckless actions that could have hard-to-reverse side effects.” www.anthropic.com/news/claude-…
View on Bluesky →
Originally reported by anthropic.com
Read the original article →Original headline: Anthropic Ships Claude Opus 5, Matches Fable 5 on Most Benchmarks at Half the Price