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GPT-5.3-Codex

OpenAI·Released Feb 5, 2026

Updated Oct 8, 11:55 PM ET

Overall score
47.7
Not ranked yet: fewer than 3 kinds of coding evaluation
Evidence
6 results
18% of scored kinds covered
Context window
400K tokens
From OpenRouter
API price, USD per 1M tokens
$1.75 / $14
Input / output · cached input $0.18

The score is on the board's scale (reference average 50, about 15 points per standard deviation), not a percentage.

By domain

Each domain is scored on the same scale as the overall score. Coverage is the share of the domain's kinds of evaluation with a result; it says how much evidence there is, not how good the model is.

Coding
50.3
1 result · 11% coverage
Research and reasoning
55.1
1 result · 13% coverage
Professional work
40.4
1 result · 11% coverage
Knowledge and accuracy
41.2
3 results · 50% coverage
Human preference
45.4
Not tested yet: shows the overall level

Every result behind the score

The result as the evaluator publishes it, and the reading it gives on the board's scale. A hard evaluation can give a high reading for a modest result; results near 95% or 5% only say "at least" or "at most".

Coding

1 result · 50.3

Research and reasoning

1 result · 55.1

Professional work

1 result · 40.4

Knowledge and accuracy

3 results · 41.2
  • AA-LCR
    Artificial Analysis · xhigh effort
    83.3%
    Reading 55.1
  • IFBench (AA run)
    Artificial Analysis · xhigh effort
    75.4%
    Reading 53.4
  • BullshitBench
    BullshitBench · high effortCapped
    12.7%
    Reading -41.3

Shown, not scored

Composite indices, saturated or older evaluations, evaluations still being checked, and vision, writing and multilingual results. They do not move the score.

No result yet

Scored evaluations this model has not taken. A missing result neither adds nor subtracts.

  • Terminal-Bench 4.0 · Vals AI
  • Terminal-Bench 4.0 (AA run) · Artificial Analysis
  • LiveBench Coding · LiveBench
  • Code Migration · Vals AI
  • ProgramBench · Vals AI
  • Vibe Code Bench 1–100 · Vals AI
  • CyberBench Patch · Vals AI
  • APEX-SWE · Mercor
  • SciCode · Artificial Analysis
  • FrontierMath Tiers 1–3 · Epoch AI
  • FrontierMath Tier 4 · Epoch AI
  • LiveBench Reasoning · LiveBench
  • Chess Puzzles · Epoch AI
  • Mystery Game Puzzles · Epoch AI
  • MysteryMechanism · Vals AI
  • Terminal-Bench Science · Vals AI
  • ProofBench · Vals AI
  • Finance Agent · Vals AI
  • APEX-Agents · Mercor
  • Harvey Legal Agent Benchmark · Vals AI
  • MedCode · Vals AI
  • Legal Research Bench · Vals AI
  • Tax Agent Bench · Vals AI
  • EMB · Vals AI
  • LiveBench Data Analysis · LiveBench
  • τ-Bench Banking (AA run) · Artificial Analysis
  • SimpleQA Verified · Epoch AI
  • LiveBench Language · LiveBench
  • LiveBench Instruction Following · LiveBench
  • Arena Text · LMArena
How readings and scores are computed