GPT-5.1 Codex vs Inkling
Side-by-side benchmark comparison across coding, math, reasoning, speed, and pricing.
Inkling by NVIDIA wins on 5 of 7 benchmarks against GPT-5.1 Codex by OpenAI, which leads on 2. This head-to-head comparison covers coding, math, reasoning, speed, and pricing metrics from our benchmark data.
Category-by-Category Breakdown
Coding: In coding, GPT-5.1 Codex scores 1197 on Design Arena ELO compared to Inkling's 1183, while Inkling scores 1227 on Website Arena ELO compared to GPT-5.1 Codex's 1174.
Reasoning: In reasoning, Inkling scores 83.2% on GPQA Diamond compared to GPT-5.1 Codex's 65.0%.
Context: In context, Inkling scores 1.0M on Context Length compared to GPT-5.1 Codex's 400K.
Pricing Comparison
GPT-5.1 Codex costs $1.3/1M input tokens and $10.0/1M output tokens, while Inkling costs $1.0/1M input and $4.0/1M output. Inkling is the more affordable option for API usage.
Verdict
Inkling leads across the board in affordability, making it the stronger overall choice in this comparison.
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GPT-5.1 Codex vs Inkling — FAQ
Which is better, GPT-5.1 Codex or Inkling?
Inkling wins on more benchmarks overall (5 vs 2). However, the best choice depends on your specific needs — each model excels in different areas.
How does GPT-5.1 Codex compare to Inkling for coding?
SWE-bench Verified data is not available for both models. Check the detailed comparison charts above for other coding-related metrics.
Is GPT-5.1 Codex cheaper than Inkling?
Yes, Inkling is cheaper. GPT-5.1 Codex costs $1.3/1M input and $10.0/1M output tokens. Inkling costs $1.0/1M input and $4.0/1M output tokens.
Which is faster, GPT-5.1 Codex or Inkling?
Output speed data is not available for both models. Check the speed section of the comparison above for available performance data.
What benchmarks does the GPT-5.1 Codex vs Inkling comparison cover?
This comparison covers 7 benchmarks including GPQA Diamond, Input Cost, Output Cost, Context Length, Cached Input Cost, Design Arena ELO, Website Arena ELO. Metrics span general intelligence, coding, math, reasoning, speed, and cost categories.