Claude Opus 5: The Claude 5 Family Is Complete — Fable-5 Power at Half the Price
Claude Opus 5: The Claude 5 Family Is Complete — Fable-5 Power at Half the Price
On 24 July 2026, Anthropic released Claude Opus 5, and with it the Claude 5 family is complete: Fable 5 at the top, Sonnet 5 for the speed-and-intelligence balance, and now Opus 5 in the middle — the model Anthropic positions as its default choice for complex agentic coding and enterprise work. The headline: near–Fable 5 capability at half the price, and the very same price developers already paid for Opus 4.8.
Claude Opus 5 in brief
Opus 5 is the direct upgrade to Opus 4.8, built to be a strong everyday assistant: it works through a hard problem end to end without much back-and-forth, and handles both coding and general office work. The official numbers from Anthropic:
- Model ID: claude-opus-5
- Pricing: 5 dollars per million input tokens, 25 per million output — identical to Opus 4.8, and half of Fable 5.
- Context window: 1M tokens (≈ 555k words).
- Max output: 128k tokens.
- Reliable knowledge cutoff: May 2026 — newer than Opus 4.8 and Fable 5 (January 2026).
- Available today on Claude API, Amazon Bedrock, Google Cloud, and Microsoft Foundry.
Why the Claude 5 family is now complete
Anthropic began its fifth generation on 9 June 2026 with Fable 5 (its most capable model, for long-running agents), followed by Sonnet 5 (the best speed-and-intelligence balance). The heart of the lineup — the Opus tier — stayed on the fourth generation until today. With Opus 5, all three primary tiers are now on the 5 generation:
| Model | Position | Input / Output per 1M tokens | Context |
|---|---|---|---|
| Fable 5 | Highest intelligence, long-running agents | $10 / $50 | 1M tokens |
| Opus 5 | Agentic coding & enterprise work | $5 / $25 | 1M tokens |
| Sonnet 5 | Best speed-and-intelligence balance | $3 / $15 | 1M tokens |
| Haiku 4.5 | Fastest and cheapest | $1 / $5 | 200k tokens |
(Haiku is still on 4.5, but the three top tiers — Fable, Opus, and Sonnet — are all on the 5 generation now.)
What changed from Opus 4.8
This is not a cosmetic bump. Anthropic's published comparisons of Opus 5 vs its predecessor:
- Coding: on Frontier-Bench v0.1, Opus 5 more than doubles Opus 4.8's performance — at a lower cost per task.
- Science: 10.2 percentage points higher on organic chemistry, and 7.7 points higher on protein-prediction tasks.
- Fresher knowledge: May 2026 cutoff vs January 2026 for 4.8.
- Same price: all of this without raising the cost above Opus 4.8.
What changed from Fable 5 (the flagship)
Fable 5 remains the reference for the hardest possible tasks, but Opus 5 gets strikingly close at half the cost — and beats it in several practical areas:
- Nearly matches its coding: on CursorBench 3.2, within 0.5% of Fable 5 — at half the cost per task.
- Wins on computer use: on OSWorld 2.0, it surpasses Fable 5's result at roughly one-third the cost.
- Better at business workflows and agentic research.
- Far fewer restrictions: it refuses and interrupts about 85% less often than Fable 5, making it better for broad, everyday deployment.
- Where Fable 5 still leads: the most advanced tasks such as cybersecurity exploit development and advanced biology (a deliberate safety gap).
Notably, Anthropic says that even at minimal effort, Opus 5 succeeds at more business-workflow tasks than other models running at high effort.
Opus 5 vs competitors, by the numbers: GPT-5.5, Gemini 3.1, and Grok 4
The real competition today is between OpenAI's GPT family (latest is GPT-5.5, launched April 2026), Google's Gemini (version 3.1), xAI's Grok 4, and DeepSeek. Anthropic's official Opus 5 figures were framed against the "next-best model" without naming it, so we complete the picture with independent numbers. Important caveat: because Opus 5 launched today, direct independent head-to-heads for it aren't in yet. The table below benchmarks Opus 4.8 (Opus 5's direct predecessor) against the field — and Opus 5 builds on and exceeds that baseline.
| Benchmark | Claude Opus 4.8 | GPT-5.5 | Gemini 3.1 Pro |
|---|---|---|---|
| SWE-bench Verified (real-world coding) | 88.6% | ≈ 80% | ≈ 82% |
| SWE-bench Pro (harder coding) | 69.2% | ≈ 64% | Lower |
| Terminal-Bench 2.1 (terminal agent) | 74.6% | 78.2% | — |
| OSWorld (computer use) | 83.4% | 78.7% | — |
| GDPval-AA (knowledge work) | 1890 | 1769 | 1314 |
| Context window | 1M tokens | 256k | 1M tokens |
| Input price / 1M tokens | $5 | Varies | $2 (under 200K) |
The read: the Opus line leads on real-world coding, computer use, and knowledge work, while GPT-5.5 edges ahead on some terminal tasks. On hard math, Anthropic's flagship Fable 5 tops FrontierMath at 87.0% vs 85.3% for GPT-5.5.
And Opus 5 itself? Anthropic says it beats the "next-best model" by roughly 3× on the abstract-reasoning benchmark ARC-AGI 3, and by about 1.5× on Zapier AutomationBench (agentic automation) for the same cost per task. On an automated behavioral audit it scored 2.3 on misaligned behavior — the lowest (best) among the compared models. In other words, Opus 5 raises the already-leading Opus 4.8 baseline above, not the reverse.
Key new features
- The "effort" switch: choose maximum intelligence, or conserve tokens for faster, cheaper results — per task.
- Fast mode: up to 2.5× the default speed (at double the price) for latency-sensitive work.
- Mid-conversation tool changes (beta) for more flexible agent workflows.
- Automatic model fallbacks (beta): switch to another model automatically when needed.
- 1M-token context for large codebases and documents in one pass.
What this means for businesses
The core of the news for any company: capabilities once reserved for the priciest model are now available at half the cost. That lowers the price of building AI assistants, automating operations, and internal coding tools — without sacrificing quality. And because Opus 5 refuses and interrupts less, with fresher knowledge, it's a more practical choice for broad deployment to users and staff.
The takeaway
With Opus 5 completing the Claude 5 family, "front-of-pack performance at a sensible price" is now available to everyone: results that rival GPT-5.5 and Gemini 3.1 and approach Fable 5, at half the top-tier cost, with fresher knowledge. For business owners, it's a good moment to re-evaluate what can be automated and built with AI.
Sources
- Anthropic — Claude Opus 5 announcement: https://www.anthropic.com/news/claude-opus-5
- Anthropic — Models overview (official specs & pricing): https://platform.claude.com/docs/en/about-claude/models/overview
- Independent comparison figures (Opus 4.8 vs GPT-5.5 and Gemini 3.1 Pro): hundredtabs.com, bitsminds.com, lmcouncil.ai
Frequently Asked Questions
What is Claude Opus 5?+
An Anthropic AI model released on 24 July 2026, the direct upgrade to Opus 4.8, built for complex agentic coding and enterprise work, priced at $5 input and $25 output per million tokens.
How much does Opus 5 cost, and why is it called half the price?+
It costs $5 per million input tokens and $25 output — the same as Opus 4.8, and half the price of the flagship Fable 5 ($10 and $50) — while performing close to Fable 5.
Is Opus 5 better than GPT-5.5 and Gemini 3.1?+
The Opus line leads on real-world coding (Opus 4.8 scores about 88.6% on SWE-bench Verified vs ~80% for GPT-5.5 and ~82% for Gemini), computer use, and knowledge work, while GPT-5.5 edges ahead on some terminal tasks. Opus 5 builds on and exceeds that baseline, and Anthropic says it beats the next-best model by 3× on ARC-AGI 3.
What's the difference between Opus 5 and Opus 4.8?+
Opus 5 roughly doubles coding performance on Frontier-Bench, advances in science (chemistry and protein), has fresher knowledge (May 2026), and costs the same as 4.8.
Is the Claude 5 family complete now?+
Yes — the three primary tiers are all on the 5 generation: Fable 5, Opus 5, and Sonnet 5. (Haiku is still on 4.5.)
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