Claude Fable 5 has arrived, promising a major leap in AI performance. Here’s what makes it powerful, how it compares, and why it matters.
AIニュース

Meet Claude Fable 5, Anthropic’s New Mythos-Class Model

On June 9, 2026, Anthropic released Claude Fable 5, the first model in a brand new top tier the company calls the Mythos class. Seven weeks later it still sits at number one on Arena’s text leaderboard, the largest human-preference board in AI, with 16,056 votes behind a 1507.6 rating. What changed since launch is the competition inside Anthropic’s own lineup. Claude Opus 5 arrived on July 24 at half the token price, and on most agentic and coding work it now matches or beats Fable 5. This article covers what Fable 5 is, how the Mythos class works, the full benchmark picture, the safeguard system, pricing, and the 18-day […]

Flat vector illustration on an orange background showing a sequence of small robots working left to right—thinking at a laptop, writing, reviewing a document with a magnifying glass, and confirming with a checkmark—under the headline “Claude Opus 4.7” and the caption “It Can Check Its Own Work.”
AIニュース

Anthropic’s Claude Opus 4.7 Just Released: Everything You Need to Know

On April 16, 2026, Anthropic released Claude Opus 4.7, its most capable generally available model to date. The update brings a 13% lift on coding benchmarks, 3x more production tasks resolved, high-resolution vision support up to 3.75 megapixels, and a new tokenizer. Pricing stays the same as Opus 4.6 at $5/$25 per million tokens. At launch, Claude Opus 4.7 shipped across the Claude API, Amazon Bedrock, Google Cloud Vertex AI, and Microsoft Foundry, replacing Opus 4.6 as the default Opus model. Opus 4.7 has since been superseded twice over. Anthropic shipped Opus 4.8, then Claude Opus 5 on July 24, 2026, which now tops the Artificial Analysis Intelligence Index at […]

Claude Opus 4.6 brings AI multi-agent coding. Learn what’s new, how it works, key benchmarks, real use cases, and why it matters for developers and teams.
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Claude Opus 4.6: Full Breakdown of Anthropic’s New AI Model with 1M Context Window

On February 5, 2026, Anthropic released Claude Opus 4.6, at the time the latest and most capable model in its Claude lineup. Arriving just three months after Opus 4.5, this release brings a 1-million-token context window to the Opus family for the first time, introduces collaborative agent teams in Claude Code, and delivers benchmark results that put it ahead of GPT-5.2 and Gemini 3 Pro across most evaluations. Months later it remains a yardstick for new contenders; ByteDance’s Seed 2.1 Pro drew level with Opus 4.6 on Code Arena: Frontend, both scoring 1539. Opus 4.6 has since been superseded. Anthropic shipped Claude Opus 5 on July 24, 2026, and it […]

Illustration of a man presenting a friendly robot, with the text ‘Claude Opus 4.5 – Here Is All You Need To Know’ on an orange background.
AIニュース

Anthropic launched Claude Opus 4.5: Faster, Cheaper, and Crazy Good at Coding

November 24, 2025. Anthropic has officially launched Claude Opus 4.5, a major refresh of its top-tier model and the company’s strongest push yet in the fight for AI leadership. Coming just days after Google’s Gemini 3 debut, the new Opus arrives with a sharp focus on professional coding, long-running agents, and desk-work automation—and Anthropic is backing the launch with aggressive pricing and hard benchmark data. The company says Opus 4.5 is now the leading model for real-world software engineering, slide and spreadsheet editing, and multi-step agentic workflows. Early numbers support the claim, with the model showing large performance gains across enterprise tasks. And in a move aimed at accelerating adoption, Anthropic has cut Opus […]