LLM Comparison

Claude Fable 5.1 vs GPT-5.3 Codex: benchmark scores, pricing & comparison.

Side-by-side Claude Fable 5.1 vs GPT-5.3 Codex comparison across SWE-bench, GPQA, HLE, Terminal-Bench, coding agent scores, token pricing, context window, and AskClash RWT. Green marks the winner on each benchmark.

Open live leaderboardClaude Fable 5.1 model pageGPT-5.3 Codex model page
Rank #1 vs #30AskClash overall scores 77.1 vs 56.6.
Pricing $10.0/$50.0 vs $1.75/$14.0Input and output token prices per 1M tokens when published.
Proprietary vs ProprietaryAnthropic vs OpenAI.

Claude Fable 5.1 vs GPT-5.3 Codex benchmark comparison

Green cells highlight the winning model for each metric. Scores are cached from the AskClash LLM leaderboard snapshot.

MetricClaude Fable 5.1GPT-5.3 Codex
Overall Score77.156.6
Leaderboard Rank#1#30
ACB79.2—
RWT9.08.0
Coding Agent Index62.2—
HLE65.042.5
GPQA93.791.5
IFEval—75.4
SWE-bench—85.0
SWE-Pro81.256.8
SWE-Atlas64.8—
Terminal-Bench91.477.3
DeepSWE67.4—
GDPval-AA1853.0—
OSWorld—64.7
Finance Agent58.9—
MMMU-Pro90.678.5
ARC-AGI 290.0—
Tau2—86.0
Input Price (per 1M tokens)$10.0$1.75
Output Price (per 1M tokens)$50.0$14.0
Context Window1M400K
Benchmarks Published1310

Claude Fable 5.1 vs GPT-5.3 Codex head-to-head charts

Claude Fable 5.1 leads 7 and GPT-5.3 Codex leads 0 of 7 shared benchmarks. GPT-5.3 Codex is cheaper on a defined 1M-input / 200K-output workload. Charts show only benchmarks both models publish.

Claude Fable 5.1GPT-5.3 Codex
Overall
77.1Claude Fable 5.1
56.6GPT-5.3 Codex
RWT
9.0Claude Fable 5.1
8.0GPT-5.3 Codex
HLE
65.0Claude Fable 5.1
42.5GPT-5.3 Codex
GPQA
93.7Claude Fable 5.1
91.5GPT-5.3 Codex
SWE-Pro
81.2Claude Fable 5.1
56.8GPT-5.3 Codex
Terminal-Bench
91.4Claude Fable 5.1
77.3GPT-5.3 Codex
MMMU-Pro
90.6Claude Fable 5.1
78.5GPT-5.3 Codex
Claude Fable 5.1
Input$10.0
Output$50.0
Workload$20
Context1M
GPT-5.3 Codex
Input$1.75
Output$14.0
Workload$4.55
Context400K

Workload = published cost of 1M input + 200K output tokens. Open the live leaderboard for interactive compare charts.

More Claude Fable 5.1 and GPT-5.3 Codex comparisons

Explore how Claude Fable 5.1 and GPT-5.3 Codex stack up against other top-ranked LLMs.

Claude Fable 5.1 vs Claude Fable 5Claude Fable 5 vs GPT-5.3 CodexClaude Fable 5.1 vs Claude Opus 5Claude Opus 5 vs GPT-5.3 CodexClaude Fable 5.1 vs GPT-5.6 SolGPT-5.6 Sol vs GPT-5.3 CodexClaude Fable 5.1 vs Qwen3.8 MaxQwen3.8 Max vs GPT-5.3 CodexClaude Fable 5.1 vs GPT-6 AstraGPT-6 Astra vs GPT-5.3 Codex

How to read this comparison

Benchmark scores

Higher is better for all benchmark scores (SWE-bench, GPQA, HLE, Terminal-Bench, etc.). Green marks the model with the higher score.

Token pricing

Lower is better for input and output prices. Green marks the cheaper model per 1M tokens.

Coverage matters

Models with fewer disclosed benchmark cells may have inflated percentile scores. Check the benchmark cell count for context.

This comparison page is generated from the AskClash LLM leaderboard cache. Open the live leaderboard for real-time scores and interactive filtering.