Opus 5 Was Just Released And Its …

2026-07-26 · Source: Data Science on Medium · Field: Technology & Digital — Artificial Intelligence & Machine Learning, Software Development & Engineering · Depth: Intermediate, quick

Summary

Anthropic has released Claude Opus 5, significantly reducing its pricing to \$5 per million input tokens and \$25 per million output tokens, a cut from Claude Fable 5's \$10/\$50 rates. Artificial Analysis places Opus 5 at 61 on its Intelligence Index, just one point above Fable 5 (60) and two points above GPT-5.6 Sol (59). Despite Opus 5's strong performance, GPT-5.6 Sol offers a much lower cost per Intelligence Index task at \$1.04, compared to Opus 5's \$2.03 and Fable 5's \$2.75. This highlights that model selection should focus on delivering acceptable work for the actual bill, rather than solely on peak performance claims.

Key takeaway

For AI Engineers or small teams evaluating large language models for coding or agent features, you should prioritize cost-per-task efficiency over marginal performance gains. While Claude Opus 5 shows strong performance, your experimentation budget will benefit significantly by routing work to models like GPT-5.6 Sol, which offers comparable intelligence at nearly half the cost per task. Focus on the model, effort setting, and coding surface that delivers acceptable results within your budget.

Key insights

Raw performance scores do not automatically translate to cost-effective AI model solutions.

Principles

• Prioritize cost-effectiveness for acceptable work over peak performance claims.
• Small intelligence index differences can hide large cost-per-task variations.

In practice

• Evaluate models by cost per task for acceptable output.
• Consider routing work to cost-efficient models like GPT-5.6 Sol.

Topics

• Claude Opus 5
• GPT-5.6 Sol
• LLM Cost-Effectiveness
• Model Selection
• Inference Costs
• Artificial Analysis Intelligence Index

Best for: CTO, VP of Engineering/Data, AI Architect, AI Engineer, Machine Learning Engineer, Director of AI/ML

Related on AIssential

• OPUS 5 CLICK NOW — Claude Opus 5 redefines LLM value, offering superior performance at a significantly lower cost per task.
• GPT-5.5: Capabilities and Reactions — GPT-5.5 offers a substantial intelligence boost for well-specified tasks, making it a strong competitor to Claude Opus 4.7.
• GPT 5.5 vs Opus 4.7: Which is the Best AI Model Today? — GPT-5.5 excels in agentic tasks and direct communication, while Claude Opus 4.7 leads in creative writing and coding.
• The Battle Of The Titans, GPT 5.6 Sol Vs Fable 5, Which One Is Better. — Cost-efficiency and specialized performance often outweigh marginal general intelligence in AI model selection.
• Introducing Claude Opus 5 — Claude Opus 5 delivers near-frontier intelligence with superior cost-efficiency and enhanced agency across diverse professional tasks.
• Snowflake CEO finds GLM-5.2 competitive with Opus 4.7 at a fraction of the cost — Chinese AI model GLM-5.2 offers competitive coding performance at a fraction of Western models' cost, intensifying market price pressure.

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Editorial summary, takeaway, and curation by AIssential. Original article published by Data Science on Medium.