Decision workspace

Anthropic vs OpenAI: source-backed comparison

A side-by-side view of attributable activity, calibrated scores, open-source signals, and market overlap for Anthropic vs OpenAI.

As of , AIIStack tracks Anthropic at 83.57/100 and OpenAI at 77.86/100 on Momentum.

Explore leaders
No paid placement or self-reported rankings. A missing value means AIIStack does not yet have enough attributable evidence to show it fairly.

Company

AN
Anthropic

anthropic.com

Foundation models
Open profile
OP
OpenAI

openai.com

Foundation models
Open profile

Signals

Cohort scores

Momentum

Freshness + release velocity

Momentum score for Anthropic
83.57/100-11.43 pts

95% confidence · Current cohort score

Momentum score for OpenAI
77.86/100+5.72 pts

95% confidence · Current cohort score

Innovation

Release cadence + freshness

Innovation score for Anthropic
83.57/100-11.43 pts

95% confidence · Current cohort score

Innovation score for OpenAI
77.86/100+5.72 pts

95% confidence · Current cohort score

Popularity

Open-source adoption

Popularity score for Anthropic
55/100+0 pts

93% confidence · Current cohort score

Popularity score for OpenAI
77.86/100+0 pts

93% confidence · Current cohort score

Visibility

Versioned prompt-panel evidence

Visibility score for Anthropic
Not scored
Visibility score for OpenAI
Not scored

Evidence

Operating signals

GitHub activity
anthropics/anthropic-sdk-python

4,002 stars · 893 forks · 215 open issues

openai/openai-python

31,941 stars · 7,887 forks · 120 open issues

Latest material change
github release

anthropics/anthropic-sdk-python released v2.3.0

98% confidence ·

github release

openai/openai-python released v3.37.0

98% confidence ·

Pricing posture
Pricing posture for Anthropic
Rolling out to Pro and Max, with more plans to follow. Read what changed (opens in new tab) Pricing Individual Team & Enterprise API Free Try Claude $0 Free for everyone Try Claude Chat on web, desktop, and mobile Search the web, create files, and run code Memory across conversations Connect your apps and tools C… $20 if billed monthly. Try Claude Everything in Free, plus: More usage* Hand off and schedule tasks Claude Design, Slides, Docs Claude Code Claude Science Projects More Claude models Claude in Chrome and Microsoft 365 Max For people who work with Claude all day From $100 Per month … Compare features across plans Search Free Try Claude Pro Try Claude Max 5x Try Claude Max 20x Try Claude Features and capabilities Features Free Pro Max 5x Max 20x @Claude No No No No Claude Code No Yes Yes Yes Claude Science No Yes Yes Yes Claude in Chrome N… $25 if billed monthly.
Pricing posture for OpenAI
Not verified
Markets
Foundation models
Foundation models

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