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Claude 3.5 Sonnet
stableNeutral
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C
Codex 5.3
stablePositive
Coverage (30d)
26vs21
This Week
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Evidence
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Timeline

Codex 5.32026-05-01

Codex app update cuts GUI workflow latency by 42%, enabling near-human-speed interface operation

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

Codex 5.32026-04-17

Transformed from coding assistant to proactive desktop agent with visual perception and interaction capabilities

Codex 5.32026-04-16

Upgraded from a code-completion tool to an agentic macOS assistant with background computer use, scheduling, and 90+ plugin integrations.

Claude 3.5 Sonnet2026-03-29

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

Codex 5.32026-03-19

Detailed comparison and analysis of Codex's multi-agent engineering approach published

Claude 3.5 Sonnet2026-03-15

Demonstration of advanced financial analysis capabilities through prompt engineering

Claude 3.5 Sonnet2026-03-11

Release delayed by 10 days due to safety considerations

Codex 5.32026-03-04

Released as native Windows application, shifting from cloud-based GitHub Copilot service

Ecosystem

Claude 3.5 Sonnet

developed byAnthropic8 src
usesAgentic AI1 src
usesagentic products1 src
usesMMLU1 src
competes withGPT-4o1 src
deploysChain-of-Thought Prompting1 src

Codex 5.3

developed byOpenAI5 src
competes withClaude Code1 src
usesLogira1 src
usesGPT-3.51 src
usesGitHub Copilot1 src
competes withCursor1 src

Benchmarks

mmlu pro
Claude 3.5 Sonnet78
Codex 5.3
arena elo
Claude 3.5 Sonnet1268
Codex 5.3
swe bench verified
Claude 3.5 Sonnet49
Codex 5.3

Evidence (1 articles)