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Large Language ModelText GenerationClaude 3.5 FamilyEnriched

Claude 3.5 Opus

Claude 3.5 Opus is Anthropic’s flagship Claude 3.5 series model optimized for high‑end reasoning, coding, and complex analysis. It offers strong performance on knowledge‑intensive tasks, multi‑step reasoning, and long‑context understanding while maintaining safety‑focused behavior. The model is accessible via Anthropic’s API and partner platforms.

by AnthropicReleased 2025-05-14Proprietary
Context Window
200K
MMLU
90.4%
HumanEval
92.0%
API Access
Available

Key Capabilities

  • +Advanced multi‑step reasoning and analysis
  • +High‑quality code generation and debugging across multiple languages
  • +Strong performance on knowledge‑intensive and professional tasks
  • +Handles very long contexts with retrieval‑style reasoning
  • +Robust instruction following and tool‑use orchestration
  • +Safety‑tuned responses with reduced harmful or biased outputs

Limitations

  • -Proprietary black‑box model with no access to weights or training data
  • -May still hallucinate or produce incorrect answers, especially on niche or very recent topics
  • -Limited transparency into training data and fine‑tuning process
  • -Not suitable for highly sensitive domains without human oversight
  • -Dependent on Anthropic’s API availability, pricing, and rate limits

Benchmark Performance

math

math

Grade School Math 8K

96.8%
math

MATH

80.5%

reasoning

reasoning

Graduate-Level Google-Proof Q&A

62.0%
reasoning

Massive Multitask Language Understanding

91.5%

conversation

conversation

Chatbot Arena Elo

1280.0Elo

coding

codingsource

HumanEval

92.0%
coding

HumanEval

92.0%

Alternatives & Comparisons

GPT-4.1LLM

OpenAI’s flagship GPT‑4.1 model with strong tool integration and ecosystem support.

Strengths
  • + Deep integration with OpenAI tools and ecosystem
  • + Competitive reasoning and coding performance
Weaknesses
  • - Proprietary with closed weights and limited transparency
  • - Pricing and rate limits may be restrictive for some workloads

Other Claude 3.5 Models

Claude 3.5 Haiku

Sources

www.anthropic.comdocs.anthropic.comdocs.anthropic.comassets.aboutamazon.comgalileo.aitextcortex.com