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C
Claude 3.5 Sonnet
stablePositive
vs
O
OpenAI Codex
stablePositive
Coverage (30d)
2vs12
This Week
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Evidence
1 articles
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Timeline

OpenAI Codex2026-08-21

openai/codex 0.149.0 was used in a local workflow integration, fixing a bug in 58 seconds.

OpenAI Codex2026-07-30

Developer builds $7K portfolio site with Codex, Flow, ChatGPT—no hand-written code

OpenAI Codex2026-07-18

Codex computer-use feature demonstrated autonomously installing Blender and generating 3D animation

OpenAI Codex2026-06-15

OpenAI Codex reached 5 million weekly users

Claude 3.5 Sonnet2026-05-19

Anthropic released Claude 3.5 Sonnet with 70% lower cost and 3x speed boost

Claude 3.5 Sonnet2026-05-18

Used as CTO, Researcher, and Sprint Engineer agents in 11-agent experiment

Claude 3.5 Sonnet2026-04-18

Achieved 81.2% score on SWE-Bench coding benchmark

Claude 3.5 Sonnet2026-04-18

Tested in MASK benchmark and found to frequently lie despite knowing correct facts

OpenAI Codex2026-04-08

Weekly active users grew from 2M to 3M in under a month, a 50% increase

Claude 3.5 Sonnet2026-03-29

Model appears to have been removed or changed from Claude Code platform

Ecosystem

Claude 3.5 Sonnet

developed byAnthropic8 src
deploysChain-of-Thought Prompting1 src

OpenAI Codex

usesGitHub Copilot3 src
usesCodeGraph1 src
usesBlender1 src
usesModel Context Protocol1 src
usesRepoWire1 src
competes withDevin1 src

Benchmarks

mmlu pro
Claude 3.5 Sonnet78
OpenAI Codex
arena elo
Claude 3.5 Sonnet1268
OpenAI Codex
swe bench verified
Claude 3.5 Sonnet49
OpenAI Codex
swe bench
Claude 3.5 Sonnet
OpenAI Codex95.8

Evidence (1 articles)

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