Claude Opus 4.5
Flagship Claude model for deep reasoning, coding, and long-horizon agents
ECI STANDING#45 of 266
SCORE150.11148.12–152.85 CI
FRONTIER LAGLaunched 1.6 months behindScores about what GPT-5 Pro did in October 2025.
SCORES LIKE THESE MODELSGPT-5 ProOpenAI · Oct 2025150.29
Full Epoch Capabilities Index ranking ↗Inkling-SmallThinking Machines · Jul 2026150.15
Kimi K2.7 CodeMoonshot · Jun 2026150.07GPT-5OpenAI · Aug 2025150.0From the lab
Launch announcement · Nov 24, 2025Released Claude Opus 4.5RELEASE DATENov 24, 2025
WEIGHTSClosed weights
CONTEXT WINDOW200K
MAX OUTPUT64K
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.