Anthropic

Claude Sonnet 4.6

Announced Feb 17, 2026

Broader computer and office work

What could it do?

Anthropic reported improvements in coding, computer use, planning and design.

What changed?

Added a million token context window in beta.

WHY IT MATTERED

Expanded access to capabilities previously associated with larger models.

Where it fell short

Beta context availability and reasoning settings affect comparisons.

Sources checked Oct 7, 2026

Release facts were checked against the sources below. Performance claims belong to the developers; we have not independently tested these models.

Developer announcement or release log

Benchmark results

EPOCH AI CAPABILITY ESTIMATE

152.2index points

Tested variant: Claude Sonnet 4.6Source interval: 149.9 to 154.5Variant date in source: Feb 17, 2026

A benchmark estimate, not a percentage or capability multiplier. Reasoning settings are not specified in this source table. Historical estimates can change in later snapshots.

Epoch AI methodology ↗Download the source snapshotChecked Oct 7, 2026 · CC BY 4.0

PUBLISHED BENCHMARK RESULT

1472rating points

Tested: claude-sonnet-4-6Text Arena Overall · October 8, 2026Reported interval: 1468 to 147670,971 votes

One explicitly named variant per release. Scores come from the same Overall snapshot; preliminary entries and reported intervals are preserved. These are current ratings of earlier variants, not their launch day ratings.

Source: Text Arena ↗Download selected resultsChecked Oct 8, 2026

Understand the benchmarks Find this release on the chart