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Model Comparison

GPT-4 Turbo vs GPT-4.5Which is better in 2026?

GPT-4.5 significantly outperforms across most benchmarks. GPT-4 Turbo is 6.3x cheaper per token.

Verdict: GPT-4 Turbo vs GPT-4.5 — which is better?

GPT-4 Turbo (by OpenAI) and GPT-4.5 (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 Turbo outperforms in 0 benchmarks, while GPT-4.5 is better at 3 benchmarks (GPQA, HumanEval, MMLU). GPT-4.5 significantly outperforms across most benchmarks.

On price, GPT-4 Turbo is roughly 6.3x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Choose GPT-4 Turbo if…

  • cost matters — it's about 6.3x cheaper per token

Choose GPT-4.5 if…

  • you want the strongest raw capability — it leads on 3 of 3 shared benchmarks
  • you want the most recent training data — it shipped Feb 2025

Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

GPT-4 Turbo outperforms in 0 benchmarks, while GPT-4.5 is better at 3 benchmarks (GPQA, HumanEval, MMLU).

GPT-4.5 significantly outperforms across most benchmarks.

Fri Aug 07 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT-4 Turbo costs less

For input processing, GPT-4 Turbo ($10.00/1M tokens) is 7.5x cheaper than GPT-4.5 ($75.00/1M tokens).

For output processing, GPT-4 Turbo ($30.00/1M tokens) is 5.0x cheaper than GPT-4.5 ($150.00/1M tokens).

In conclusion, GPT-4.5 is more expensive than GPT-4 Turbo.*

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

Lowest available price from all providers
Fri Aug 07 2026 • llm-stats.com
OpenAI
GPT-4 Turbo
Input tokens$10.00
Output tokens$30.00
Best providerAzure
OpenAI
GPT-4.5
Input tokens$75.00
Output tokens$150.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Both models have the same input context window of 128,000 tokens. Both models can generate responses up to 4,096 tokens.

OpenAI
GPT-4 Turbo
Input128,000 tokens
Output4,096 tokens
OpenAI
GPT-4.5
Input128,000 tokens
Output4,096 tokens
Fri Aug 07 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

GPT-4.5 supports multimodal inputs, whereas GPT-4 Turbo does not.

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

GPT-4 Turbo

Text
Images
Audio
Video

GPT-4.5

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 Turbo

Proprietary

Closed source

GPT-4.5

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-4 Turbo was released on 2024-04-09, while GPT-4.5 was released on 2025-02-27.

GPT-4.5 is 11 months newer than GPT-4 Turbo.

GPT-4 Turbo

Apr 9, 2024

2.3 years ago

GPT-4.5

Feb 27, 2025

1.4 years ago

10mo newer

Knowledge Cutoff

When training data ends

GPT-4 Turbo has a documented knowledge cutoff of 2023-12-31, while GPT-4.5's cutoff date is not specified.

We can confirm GPT-4 Turbo's training data extends to 2023-12-31, but cannot make a direct comparison without GPT-4.5's cutoff date.

GPT-4 Turbo

Dec 2023

GPT-4.5

—

Provider Availability

GPT-4 Turbo is available from Azure, OpenAI. GPT-4.5 is available from OpenAI.

GPT-4 Turbo

azure logo
Azure
Input Price:Input: $10.00/1MOutput Price:Output: $30.00/1M
openai logo
OpenAI
Input Price:Input: $10.00/1MOutput Price:Output: $30.00/1M

GPT-4.5

openai logo
OpenAI
Input Price:Input: $75.00/1MOutput Price:Output: $150.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

OpenAI
Less expensive input tokens
Less expensive output tokens
OpenAI
Supports multimodal inputs
Higher GPQA score (69.5% vs 48.0%)
Higher HumanEval score (88.0% vs 87.1%)
Higher MMLU score (90.8% vs 86.5%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against GPT-4 Turbo and GPT-4.5 side-by-side, then vote on the output you prefer.

GPT-4 Turbo
✓ Preferred
GPT-4.5
Open in Playground
AI Model Comparison Table
Feature
OpenAI
GPT-4 Turbo
OpenAI
GPT-4.5

FAQ

Common questions about GPT-4 Turbo vs GPT-4.5.

Which is better, GPT-4 Turbo or GPT-4.5?

GPT-4.5 significantly outperforms across most benchmarks. GPT-4 Turbo is made by OpenAI and GPT-4.5 is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT-4 Turbo compare to GPT-4.5 in benchmarks?

GPT-4 Turbo scores MGSM: 88.5%, HumanEval: 87.1%, MMLU: 86.5%, DROP: 86.0%, MATH: 72.6%. GPT-4.5 scores GSM8k: 97.0%, MMLU: 90.8%, CharXiv-D: 90.0%, IFEval: 88.2%, HumanEval: 88.0%.

Is GPT-4 Turbo cheaper than GPT-4.5?

GPT-4 Turbo is 7.5x cheaper for input tokens. GPT-4 Turbo costs $10.00/M input and $30.00/M output via azure. GPT-4.5 costs $75.00/M input and $150.00/M output via openai.

What are the context window sizes for GPT-4 Turbo and GPT-4.5?

GPT-4 Turbo supports 128K tokens and GPT-4.5 supports 128K 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 Turbo and GPT-4.5?

Key differences include input pricing ($10.00 vs $75.00/M), multimodal support (no vs yes). See the full comparison above for benchmark-by-benchmark results.

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