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Codex vs pi

Codex is the full coding harness; pi is deliberately small and lets you steer it mid-run.

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Model benchmarks

Artificial Analysis

Intelligence v4.3

General capability across the lab's whole suite.

Not published
47.1
CodexGPT-6.1 Sol
piGPT-5.6 Sol (max)

Coding

The coding subset of the same suite.

Not published
77.4
CodexGPT-6.1 Sol
piGPT-5.6 Sol (max)

Agentic

Tasks the model runs in several steps.

Not published
50.5
CodexGPT-6.1 Sol
piGPT-5.6 Sol (max)

These describe the model on its own, not the harness, the tools or the whole setup this page compares — and the lab runs each model at maximum effort, which is not what the composer above is set to. Scores are only comparable within one index version.

Source: Artificial Analysis — their published model index, taken 2026-09-16.

Codex vs pi: models, pricing and features

Compare these configurations on the same task, choose the result you prefer, then continue your chosen session. Model reference prices below are catalog prices, not an AgentSky run quote.

ConfigurationCodexpi
ModelGPT-6.1 SolGPT-5.6 Sol
Thinking levelMediumMedium
CatalogCodexGPT-6.1 Sol· Not listedpiopenai/gpt-5.6-sol
Input$ / 1M tokens—2.00
Output$ / 1M tokens—10.00
Context windowtokens—1.1M
Providers serving it—3

List price for the model alone. What a run from this page costs also depends on the harness, the tools it calls and how long it works.

Source: OpenRouter — the open model catalog, taken 2026-09-17. A dash is something they do not publish for that option.

Frequently asked questions

Related resources

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Claude Code vs DeepSeek Harness vs Codex

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