Best AI Models for Agents in 2026

Right now we put Grok 4.20 from xAI at the top, primarily because it scores highest on the agent triad — tool calling, structured output and reasoning — with a workable output token limit. Rankings are recomputed from live model metadata — see "How we picked these" above for the exact rule.

DeepSeek V4 Pro (DeepSeek) is the lowest-priced pick at $0.435 per 1M input tokens and $0.870 per 1M output tokens. Costs from other entries scale up from there.

Each pick comes from a programmatic rule defined in our use-case-rules config: a hard filter (e.g. tool calling required, context ≥ 100K) plus a numeric score combining capability, context window and price. We never hand-curate the order, but we do hand-curate the rule. Underlying model metadata is refreshed daily from a normalised canonical catalogue.

The underlying model data is refreshed once per day, and the static page is rebuilt when the data changes. The 'Last updated' date below shows the most recent rebuild.

Coding and agent workflows almost always need to invoke external tools — the editor, a shell, a test runner, a database. Without first-class function calling, you have to parse free-form text the model emits, which is fragile in production.