Claude Opus 4.8

by Anthropic

Claude Opus 4.8 is Anthropic's flagship large language model released May 28, 2026, achieving top rankings on SWE-bench Pro (69.2%) and the Artificial Analysis GDPval-AA leaderboard (1890 Elo). It introduces Dynamic Workflows for orchestrating hundreds of parallel subagents and Effort Control for adjustable reasoning depth, with a 1M token context window by default.

Large Language Models
Proprietary

Primary Use Cases

  • Agentic software engineering and large-scale code migrations
  • Complex mathematical reasoning
  • Long-context document analysis
  • Autonomous multi-step task execution
  • Enterprise AI workflows

✅ Strengths

  • Top-ranked on SWE-bench Pro (69.2%) and Artificial Analysis leaderboard
  • 96.7% on USAMO 2026 math benchmark
  • Lower hallucination rate than GPT-5.5 per Anthropic reports
  • Drop-in replacement for Opus 4.7
  • Multi-cloud availability (Bedrock, Vertex AI, Foundry)

⚠️ Limitations

  • More verbose reasoning increases token consumption vs predecessors
  • Fast Mode pricing ($10/$50 per million tokens) is expensive at scale
  • No free tier — requires paid Claude plan or API access
  • Effort control default 'high' may surprise developers migrating from 4.7

🏆 Performance Benchmarks

Standardized benchmark scores for objective comparison

SWE-bench Pro(Coding)
69.2%

Vendor-reported; outperforms GPT-5.5 (58.6%) on this benchmark

USAMO 2026(Mathematics)
96.7%

Vendor-reported math benchmark

Artificial Analysis GDPval-AA(General Intelligence)
1890Elo

Outperforms GPT-5.5 and Opus 4.7 on this leaderboard

Technical Specifications

Developer
Anthropic
Category
Large Language Models
Type
🧠 Foundation Model
License
UNKNOWN
Version
4.8

Performance Benchmarks

SWE-bench Pro69.2%
USAMO 202696.7%
Artificial Analysis GDPval-AA1890Elo

Source: View benchmark details

Trust & Privacy

Health Status
🟢 Active
Privacy Grade
✅ Grade B
Trains on User Data
🔄 Opt-out available
Certifications
None listed

Ecosystem & Integrations

API Access
✅ Available
Chrome Extension
❌ No
Mobile App
✅ Available
Pricing Model
💰 Pay Per Use

Pricing Breakdown

Standard API

Pay-per-use API access at standard speed

Input$5/M tokens
Output$25/M tokens
0
Fast Mode API

2.5x faster processing via API

Input$10/M tokens
Output$50/M tokens
0
Claude Pro

Subscription plan with included usage budget

Monthly$20/mo