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Claude Code vs DeepSeek Harness vs Codex

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Model benchmarks

Artificial Analysis

Intelligence v4.3

General capability across the lab's whole suite.

Not published
39.5
Not published
Claude CodeClaude Opus 5.5
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.

Claude Code vs 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.

ConfigurationClaude CodeDeepSeek HarnessCodex
ModelClaude Opus 5.5DeepSeek V4.1 FlashGPT-6.1 Sol
Thinking levelHighNot configurableMedium
CatalogClaude CodeClaude Opus 5.5· Not listedDeepSeek Harnessdeepseek/deepseek-v4.1-flashCodexGPT-6.1 Sol· Not listed
Input$ / 1M tokens—0.30—
Output$ / 1M tokens—1.20—
Context windowtokens—1.0M—
Providers serving it—19—

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 A dash is something they do not publish for that option.

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