Anthropic
Claude 3.7 Sonnet
Announced Feb 24, 2025
Reasoning and coding in one model
What could it do?
Produce a standard response or use extended thinking for a harder task.
What changed?
Users could choose a reasoning mode within the same model; API users could also set a thinking budget.
Hybrid reasoning
Claude Code introduced a terminal workflow for reading files, editing code and running tools.
Where it fell short
Coding benchmark results depend on the tools, retry budget and evaluation setup around the model.
February 2025 release, alongside the limited Claude Code research preview. Check sources
- Reasoning modes
- Standard and extended
- Companion tool
- Claude Code
- Tool access at launch
- Limited research preview
What this meant in practice
A model and a coding agent are different layers. The model proposes actions; the surrounding tool lets it inspect files or execute tests. More thinking and more tool access also change the time and cost of a task.
Investigate a failing test
Give an agent a repository and a specific failure. Ask it to explain the cause, propose a change and run the relevant checks. Review the change before treating the task as complete.
Common question
Is Claude Code the model itself?
No. Claude Code is a tool that uses a model to work in a software environment.
Release facts were checked against the sources below. Performance claims belong to the developers; we have not independently tested these models.
Anthropic: Claude 3.7 Sonnet and Claude CodeBenchmark results
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 4.0One 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