Model Comparison

GPT-4.5 vs o1Which is better in 2026?

o1 shows notably better performance in the majority of benchmarks. o1 is 3.6x cheaper per token.

Verdict: GPT-4.5 vs o1 — which is better?

GPT-4.5 (by OpenAI) and o1 (by OpenAI) 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.

GPT-4.5 outperforms in 2 benchmarks (MathVista, SimpleQA), while o1 is better at 9 benchmarks (AIME 2024, GPQA, GSM8k, HumanEval, MMLU, MMMLU, MMMU, SWE-Bench Verified, TAU-bench Retail). o1 shows notably better performance in the majority of benchmarks.

On price, o1 is roughly 3.6x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

o1 also accepts a larger context window (200,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose GPT-4.5 if…

  • you want the most recent training data — it shipped Feb 2025

Choose o1 if…

  • you want the strongest raw capability — it leads on 10 of 12 shared benchmarks
  • cost matters — it's about 3.6x cheaper per token
  • you process long inputs — it offers a 200,000 token context window

Performance Benchmarks

Comparative analysis across standard metrics

12 benchmarks

GPT-4.5 outperforms in 2 benchmarks (MathVista, SimpleQA), while o1 is better at 9 benchmarks (AIME 2024, GPQA, GSM8k, HumanEval, MMLU, MMMLU, MMMU, SWE-Bench Verified, TAU-bench Retail).

o1 shows notably better performance in the majority of benchmarks.

Wed Jul 29 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

o1 costs less

For input processing, GPT-4.5 ($75.00/1M tokens) is 5.0x more expensive than o1 ($15.00/1M tokens).

For output processing, GPT-4.5 ($150.00/1M tokens) is 2.5x more expensive than o1 ($60.00/1M tokens).

In conclusion, GPT-4.5 is more expensive than o1.*

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

Lowest available price from all providers
Wed Jul 29 2026 • llm-stats.com
OpenAI
GPT-4.5
Input tokens$75.00
Output tokens$150.00
Best providerOpenAI
OpenAI
o1
Input tokens$15.00
Output tokens$60.00
Best providerAzure
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

o1 accepts 200,000 input tokens compared to GPT-4.5's 128,000 tokens. o1 can generate longer responses up to 100,000 tokens, while GPT-4.5 is limited to 4,096 tokens.

OpenAI
GPT-4.5
Input128,000 tokens
Output4,096 tokens
OpenAI
o1
Input200,000 tokens
Output100,000 tokens
Wed Jul 29 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

GPT-4.5 supports multimodal inputs, whereas o1 does not.

GPT-4.5 can handle both text and other forms of data like images, making it suitable for multimodal applications.

GPT-4.5

Text
Images
Audio
Video

o1

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-4.5

Proprietary

Closed source

o1

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-4.5 was released on 2025-02-27, while o1 was released on 2024-12-17.

GPT-4.5 is 2 months newer than o1.

GPT-4.5

Feb 27, 2025

1.4 years ago

2mo newer
o1

Dec 17, 2024

1.6 years ago

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Provider Availability

GPT-4.5 is available from OpenAI. o1 is available from Azure, OpenAI.

GPT-4.5

openai logo
OpenAI
Input Price:Input: $75.00/1MOutput Price:Output: $150.00/1M

o1

azure logo
Azure
Input Price:Input: $15.00/1MOutput Price:Output: $60.00/1M
openai logo
OpenAI
Input Price:Input: $15.00/1MOutput Price:Output: $60.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

OpenAI
Supports multimodal inputs
Higher MathVista score (72.3% vs 71.8%)
Higher SimpleQA score (62.5% vs 47.0%)
OpenAI
Larger context window (200,000 tokens)
Less expensive input tokens
Less expensive output tokens
Higher AIME 2024 score (74.3% vs 36.7%)
Higher GPQA score (78.0% vs 69.5%)
Higher GSM8k score (97.1% vs 97.0%)
Higher HumanEval score (88.1% vs 88.0%)
Higher MMLU score (91.8% vs 90.8%)
Higher MMMLU score (87.7% vs 85.1%)
Higher MMMU score (77.6% vs 75.2%)
Higher SWE-Bench Verified score (41.0% vs 38.0%)
Higher TAU-bench Retail score (70.8% vs 68.4%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against GPT-4.5 and o1 side-by-side, then vote on the output you prefer.

GPT-4.5
✓ Preferred
o1
Open in Playground
AI Model Comparison Table
Feature
OpenAI
GPT-4.5
OpenAI
o1

FAQ

Common questions about GPT-4.5 vs o1.

Which is better, GPT-4.5 or o1?

o1 shows notably better performance in the majority of benchmarks. GPT-4.5 is made by OpenAI and o1 is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT-4.5 compare to o1 in benchmarks?

GPT-4.5 scores GSM8k: 97.0%, MMLU: 90.8%, CharXiv-D: 90.0%, IFEval: 88.2%, HumanEval: 88.0%. o1 scores GSM8k: 97.1%, MATH: 96.4%, GPQA Physics: 92.8%, MMLU: 91.8%, MGSM: 89.3%.

Is GPT-4.5 cheaper than o1?

o1 is 5.0x cheaper for input tokens. GPT-4.5 costs $75.00/M input and $150.00/M output via openai. o1 costs $15.00/M input and $60.00/M output via azure.

What are the context window sizes for GPT-4.5 and o1?

GPT-4.5 supports 128K tokens and o1 supports 200K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT-4.5 and o1?

Key differences include context window (128K vs 200K), input pricing ($75.00 vs $15.00/M), multimodal support (yes vs no). See the full comparison above for benchmark-by-benchmark results.

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