A recent analysis comparing the capabilities and API prices of 23 large language models reveals that the most expensive models are not necessarily the smartest. The Epoch Capabilities Index (ECI) was used to score models on various benchmarks, with prices sourced from API lists as of October 2026. The study found that top-tier models like Claude Opus 5.5 and GPT-6 Astra, while highly capable, are not the most cost-effective. Cheaper, yet still powerful, models such as Claude Sonnet 5.5, Gemini 3.8 Flash, and DeepSeek-V4 Flash offer significant value for common tasks. AI
IMPACT Identifies cost-effective LLMs for various tasks, guiding developers and businesses in model selection.
RANK_REASON Analysis comparing LLM capabilities and prices, not a direct release or product launch.
- Artificial Analysis Intelligence Index
- Claude Fable 5-1
- Claude Opus 5.5
- Claude Sonnet 5.5
- DeepSeek-V4 Flash
- Epoch AI
- Epoch Capabilities Index
- Gemini-3.1 Pro
- Gemini 3.8 Flash
- GPT-5.5
- GPT-6 Astra
- GPT-6 Sol
- Claude
- GPT-6.1 Sol
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