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Evidence-based comparison

o3 (2025-04-16) vs Claude 4 Sonnet (20250514, extended thinking)

Compare the configurations using only independent benchmarks where both have published results under the same version and methodology.

OpenAIversusAnthropicChecked August 13, 2026
Like-for-like results

Shared benchmark scores

No cross-benchmark averaging. A higher score is better for every comparison shown below.

Benchmarko3 (2025-04-16)Claude 4 Sonnet (20250514, extended thinking)
HELM Capabilities0.8110.766
HELM Safety0.9820.981

o3 (2025-04-16)

Published by OpenAI. This profile currently contains 3 independently sourced benchmark results.

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Claude 4 Sonnet (20250514, extended thinking)

Published by Anthropic. This profile currently contains 2 independently sourced benchmark results.

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