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DeepSeek Harness vs Codex

Two house pairings: OpenAI's harness on GPT models, DeepSeek's on its own. Your task decides.

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Model benchmarks

Artificial Analysis

Intelligence v4.3

General capability across the lab's whole suite.

39.5
Not published
DeepSeek HarnessDeepSeek V4.1 Flash (Reasoning, Max Effort)
CodexGPT-6.1 Sol

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.

DeepSeek Harness vs Codex: 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.

ConfigurationDeepSeek HarnessCodex
ModelDeepSeek V4.1 FlashGPT-6.1 Sol
Thinking levelNot configurableMedium
CatalogDeepSeek Harnessdeepseek/deepseek-v4.1-flashCodexGPT-6.1 Sol· Not listed
Input$ / 1M tokens0.30—
Output$ / 1M tokens1.20—
Context windowtokens1.0M—
Providers serving it19—

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 A dash is something they do not publish for that option.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

Claude Code vs Codex

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Claude Code vs DeepSeek Harness

Put Claude Code and the DeepSeek Harness on the same task and pick a winner. Live head-to-head record from community verdicts.

Codex vs pi

Compare Codex with pi, the minimal harness with live steering. Send the same task to both and pick the better answer.

All comparisons

Start with editable options.