Model Comparison

GPT-5.1 Codex vs Nova ProWhich is better in 2026?

Comparing GPT-5.1 Codex and Nova Pro across benchmarks, pricing, and capabilities.

Verdict: GPT-5.1 Codex vs Nova Pro — which is better?

GPT-5.1 Codex (by OpenAI) and Nova Pro (by Amazon) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

On price, Nova Pro is roughly 2.5x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

GPT-5.1 Codex also accepts a larger context window (400,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose GPT-5.1 Codex if…

  • you process long inputs — it offers a 400,000 token context window
  • you want the most recent training data — it shipped Nov 2025

Choose Nova Pro if…

  • cost matters — it's about 2.5x cheaper per token
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Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

GPT-5.1 Codex and Nova Prodon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Nova Pro costs less

For input processing, GPT-5.1 Codex ($1.25/1M tokens) is 1.6x more expensive than Nova Pro ($0.80/1M tokens).

For output processing, GPT-5.1 Codex ($10.00/1M tokens) is 3.1x more expensive than Nova Pro ($3.20/1M tokens).

In conclusion, GPT-5.1 Codex is more expensive than Nova Pro.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Tue Jun 23 2026 • llm-stats.com
OpenAI
GPT-5.1 Codex
Input tokens$1.25
Output tokens$10.00
Best providerOpenAI
Amazon
Nova Pro
Input tokens$0.80
Output tokens$3.20
Best providerAWS Bedrock
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

GPT-5.1 Codex accepts 400,000 input tokens compared to Nova Pro's 300,000 tokens. Nova Pro can generate longer responses up to 300,000 tokens, while GPT-5.1 Codex is limited to 128,000 tokens.

OpenAI
GPT-5.1 Codex
Input400,000 tokens
Output128,000 tokens
Amazon
Nova Pro
Input300,000 tokens
Output300,000 tokens
Tue Jun 23 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both GPT-5.1 Codex and Nova Pro support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

GPT-5.1 Codex

Text
Images
Audio
Video

Nova Pro

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

GPT-5.1 Codex

Proprietary

Closed source

Nova Pro

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-5.1 Codex was released on 2025-11-19, while Nova Pro was released on 2024-11-20.

GPT-5.1 Codex is 12 months newer than Nova Pro.

GPT-5.1 Codex

Nov 19, 2025

7 months ago

12mo newer
Nova Pro

Nov 20, 2024

1.6 years ago

Knowledge Cutoff

When training data ends

GPT-5.1 Codex has a documented knowledge cutoff of 2024-09-30, while Nova Pro's cutoff date is not specified.

We can confirm GPT-5.1 Codex's training data extends to 2024-09-30, but cannot make a direct comparison without Nova Pro's cutoff date.

GPT-5.1 Codex

Sep 2024

Nova Pro

—

Provider Availability

GPT-5.1 Codex is available from OpenAI. Nova Pro is available from Bedrock.

GPT-5.1 Codex

openai logo
OpenAI
Input Price:Input: $1.25/1MOutput Price:Output: $10.00/1M

Nova Pro

bedrock logo
AWS Bedrock
Input Price:Input: $0.80/1MOutput Price:Output: $3.20/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

OpenAI
Larger context window (400,000 tokens)
Amazon
Less expensive input tokens
Less expensive output tokens

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
GPT-5.1 Codex
Amazon
Nova Pro

FAQ

Common questions about GPT-5.1 Codex vs Nova Pro.

Which is better, GPT-5.1 Codex or Nova Pro?

GPT-5.1 Codex (OpenAI) and Nova Pro (Amazon) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does GPT-5.1 Codex compare to Nova Pro in benchmarks?

GPT-5.1 Codex scores SWE-Bench Verified: 73.7%, SWE-Lancer: 66.3%, Terminal-Bench 2.0: 52.8%. Nova Pro scores ARC-C: 94.8%, GSM8k: 94.8%, DocVQA: 93.5%, IFEval: 92.1%, ChartQA: 89.2%.

Is GPT-5.1 Codex cheaper than Nova Pro?

Nova Pro is 1.6x cheaper for input tokens. GPT-5.1 Codex costs $1.25/M input and $10.00/M output via openai. Nova Pro costs $0.80/M input and $3.20/M output via bedrock.

What are the context window sizes for GPT-5.1 Codex and Nova Pro?

GPT-5.1 Codex supports 400K tokens and Nova Pro supports 300K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT-5.1 Codex and Nova Pro?

Key differences include context window (400K vs 300K), input pricing ($1.25 vs $0.80/M). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-5.1 Codex and Nova Pro?

GPT-5.1 Codex is developed by OpenAI and Nova Pro is developed by Amazon.

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