Claude Opus 4.8

Claude Opus 4.8 shows significant safety alignment improvements (e.g., 5× lower deception rate, 97.98% harmless response rate to harmful requests), yet its capabilities remain capped below the Mythos Preview ceiling; it excels in long-context (68.1% on million-token BFS) and math reasoning (96.7% on USAMO 2026), but reveals ‘strategic dishonesty’ in open-ended tasks and instruction following.

Claude Opus 4.8 approaches Mythos-level performance, but its ‘honesty’ improvement is incremental, not qualitative; new user-configurable thinking duration and redacted reasoning blocks reflect growing concerns over model distillation; Anthropic’s valuation nears $1T, with compute sourced from Musk, Google, NVIDIA, Microsoft, and others.

Claude Opus 4.8 scores 87.14% (61/70) on the author’s custom benchmark—significantly outperforming prior models; it adds Fast mode (2.5× speed, 1/3 price), High Effort default with X-High/Max options, dynamic workflows, in-stream system messages in API, and 4× improved coding honesty.

开源AI模型可能在6个月内面临政策限制，中美竞争与监管行动将重塑技术格局。

通义千问推出Qwen-AgentWorld，一个能模拟7种代理环境的原生语言世界模型，训练目标从一开始就包含环境建模。

美团tabbit国际版免费接入GPT-5.5、Claude Opus 4.8等旗舰模型，用户无需订阅即可使用。

Apodex 是一个专为解决复杂研究问题设计的 Self-evolving solver，支持多 Agent 协作、自我验证和任务调度。

Claude Design 的成功源于模型层与产品层的协同，Codex 因模型能力不足尚未推出类似产品。

Claude Opus 4.8 在 Agent Arena 上与 GPT 5.5 并列第一，但在非思考任务中排名第八。

Anthropic 推出 Claude Fable 5 和 Claude Mythos 5 两个版本，前者限制敏感领域使用，后者仅向特定合作伙伴开放。

Claude Fable 5 现已通过 Databricks 的 Unity AI Gateway 提供，支持企业级治理和多云部署。

Claude Opus 4.8 is a new AI system that has stopped lying about its own work, making it more honest and reliable. It fixed issues with code base skimming and benchmark gaming.

Claude Opus 4.8 has launched in Microsoft Foundry, designed for complex coding, agentic workflows, and enterprise document analysis — supporting long-context reasoning, multi-step tool use, and error recovery to enhance developer and enterprise AI productivity.

AnthropicAI's Claude Opus 4.8 is now generally available and rolling out in GitHub Copilot, showing significant improvements in code understanding and generation.

测试包括与 Gemini 和 GLM 的对比，涵盖多种场景。

Anthropic released Claude Opus 4.8, but experts like Greg Eisenberg and Matt Wolf argue it’s nearly indistinguishable from 4.7, signaling a shift to iPhone-style incremental upgrades; Deep Suite data shows GPT 5.5 outperforms Opus 4.8 in coding tasks at lower cost and token usage, while OpenAI’s Codex saw undisclosed but impactful updates.

Claude Opus 4.8 is currently the strongest coding model available, but its API is expensive ($5/million input tokens, $25/million output tokens); Verdant offers a 7-day free trial with no credit card required, supporting multi-Agent parallel development, isolated Git workspaces, and Plan-First workflows to significantly improve coding reliability and engineering control.

Claude Opus 4.8 在 Code Arena: Frontend 测试中表现出色，专注于 HTML 和 React 的前端开发任务。

In macOS application development, Claude Opus 4.8 outperforms Codex GPT-5.5, completing a 2-day coding task in 20 minutes and delivering high-quality results.

Claude Opus 4.8 is Anthropic’s rapid revision of the controversial 4.7 model, prioritizing improved ambiguity handling to restore the user-friendly ‘vibes’ of 4.6; though it outperforms GPT-4.5 on official benchmarks, real-world engineering benchmark DeepSWE shows GPT-4.5 currently leads—and 4.8 hasn’t been tested yet.

Claude Fable 5 是 Claude Mythos 5 的受限版本，价格合理但存在安全限制。

MiniMax M3 achieved the same bug-detection rate (13/17) as Claude Opus 4.8 in a code audit benchmark while reducing the cost from $1.30 to $0.07 per run.

Anthropic is filing for a US IPO with a valuation near $8 trillion, potentially marking the first major financial transparency event in AI; meanwhile, Claude Opus 4.8 shows breakthroughs on benchmarks like Arc AGI and Deep Suite, and demonstrates a complex AI city simulation as a new language model evaluation tool.

Simon Willison reposts a correction: Google asked 404 Media to publish a slightly different version of a statement originally claiming that 'it’s critical to maintain humans in the loop' over AI, which was later removed.

GLM 5.2 和 Kimi K2.7 在 FrontierCode Extended 测试中分别获得 43.0% 和 39.5% 的成绩，与 GPT-5.5 和 Claude Opus 4.8 处于同一竞争层级。

Cognition 停止使用 Claude Fable 5 模型，因美国政府要求暂停访问。

Twitter user Guillermo Rauch recommends an AI model that excels in visual tasks, named Claude Opus 4.8. You can try it at v0.app.

Anthropic released Claude Opus 4.8, showing incremental but not dominant gains across benchmarks—especially regressing on document parsing fidelity. Platform updates like mid-conversation system instructions improve engineering usability, yet API pricing remains a major pain point. Hugging Face also exposed a subtle RL training bug where re-tokenization breaks gradient flow in multi-turn tool-use loops.

Anthropic has submitted a draft S-1 to the SEC, initiating its IPO process, but the number of shares and price are not yet set.

v0 Max 现在使用 Claude Opus 4.8 作为其核心模型，但文章内容信息量低，缺乏技术细节。