OpenAI
GPT-5.4
Announced Mar 5, 2026
Reasoning and coding for professional work
What could it do?
OpenAI combined recent reasoning and coding advances with document, spreadsheet and tool workflows.
What changed?
Brought capabilities from GPT-5.3 Codex into a broader model.
Supported work spanning multiple computer applications.
Where it fell short
Thinking, Pro and API configurations should not be mixed into one benchmark result.
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 logBenchmark 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