Claude Opus 5
Strongest Claude Opus model for coding, agents, and professional work
ECI STANDING#4 of 266
SCORE162.3159.9–165.74 CI
FRONTIER LAGLaunched 1.5 months behindScores about what Claude Fable 5 did in June 2026.
SCORES LIKE THESE MODELSClaude Fable 5.1Anthropic · Sep 2026164.47Claude Fable 5Anthropic · Jun 2026163.27GPT-5.5 ProOpenAI · Apr 2026162.25GPT-5.6 SolOpenAI · Jul 2026161.81
Full Epoch Capabilities Index ranking ↗From the lab
Launch announcement · Jul 24, 2026Released Claude Opus 5Launch announcement · Jul 24, 2026Introducing Claude Opus 5RELEASE DATEJul 24, 2026
WEIGHTSClosed weights
CONTEXT WINDOW1M
MAX OUTPUT128K
REASONINGYes
TOOL CALLINGYes
INPUTStext, image, pdf
OUTPUTStext
Specifications from Models.dev. Availability and limits may differ by provider. Benchmark scores come from Epoch AI under CC BY 4.0.