Model Comparison

GPT-5 vs o3Which is better in 2026?

GPT-5 significantly outperforms across most benchmarks. GPT-5 is 1.0x cheaper per token.

Verdict: GPT-5 vs o3 — which is better?

GPT-5 (by OpenAI) and o3 (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-5 outperforms in 16 benchmarks (Aider-Polyglot, AIME 2025, BrowseComp, CharXiv-R, COLLIE, ERQA, FrontierMath, GPQA, Humanity's Last Exam, MMMU, MMMU-Pro, Multi-Challenge, SWE-Bench Verified, Tau2 Retail, Tau2 Telecom, VideoMMMU), while o3 is better at 1 benchmark (Tau2 Airline). GPT-5 significantly outperforms across most benchmarks.

GPT-5 also accepts a larger context window (400,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose GPT-5 if…

  • you want the strongest raw capability — it leads on 16 of 17 shared benchmarks
  • you process long inputs — it offers a 400,000 token context window
  • you want the most recent training data — it shipped Aug 2025

Choose o3 if…

  • you want predictable pricing at $2.00/M input and $8.00/M output

Performance Benchmarks

Comparative analysis across standard metrics

17 benchmarks

GPT-5 outperforms in 16 benchmarks (Aider-Polyglot, AIME 2025, BrowseComp, CharXiv-R, COLLIE, ERQA, FrontierMath, GPQA, Humanity's Last Exam, MMMU, MMMU-Pro, Multi-Challenge, SWE-Bench Verified, Tau2 Retail, Tau2 Telecom, VideoMMMU), while o3 is better at 1 benchmark (Tau2 Airline).

GPT-5 significantly outperforms across most benchmarks.

Tue Jun 30 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT-5 costs less

For input processing, GPT-5 ($1.25/1M tokens) is 1.6x cheaper than o3 ($2.00/1M tokens).

For output processing, GPT-5 ($10.00/1M tokens) is 1.3x more expensive than o3 ($8.00/1M tokens).

In conclusion, o3 is more expensive than GPT-5.*

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

Lowest available price from all providers
Tue Jun 30 2026 • llm-stats.com
OpenAI
GPT-5
Input tokens$1.25
Output tokens$10.00
Best providerOpenAI
OpenAI
o3
Input tokens$2.00
Output tokens$8.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

GPT-5 accepts 400,000 input tokens compared to o3's 200,000 tokens. GPT-5 can generate longer responses up to 128,000 tokens, while o3 is limited to 100,000 tokens.

OpenAI
GPT-5
Input400,000 tokens
Output128,000 tokens
OpenAI
o3
Input200,000 tokens
Output100,000 tokens
Tue Jun 30 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both GPT-5 and o3 support multimodal inputs.

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

GPT-5

Text
Images
Audio
Video

o3

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

Proprietary

Closed source

o3

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-5 was released on 2025-08-07, while o3 was released on 2025-04-16.

GPT-5 is 4 months newer than o3.

GPT-5

Aug 7, 2025

10 months ago

3mo newer
o3

Apr 16, 2025

1.2 years ago

Knowledge Cutoff

When training data ends

GPT-5 has a knowledge cutoff of 2024-09-30, while o3 has a cutoff of 2024-05-31.

GPT-5 has more recent training data (up to 2024-09-30), making it potentially better informed about events through that date compared to o3 (2024-05-31).

GPT-5

Sep 2024

4 mo newer
o3

May 2024

Provider Availability

GPT-5 is available from OpenAI. o3 is available from OpenAI.

GPT-5

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

o3

openai logo
OpenAI
Input Price:Input: $2.00/1MOutput Price:Output: $8.00/1M
* 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)
Less expensive input tokens
Higher Aider-Polyglot score (88.0% vs 81.3%)
Higher AIME 2025 score (94.6% vs 86.4%)
Higher BrowseComp score (54.9% vs 49.7%)
Higher CharXiv-R score (81.1% vs 78.6%)
Higher COLLIE score (99.0% vs 98.4%)
Higher ERQA score (65.7% vs 64.0%)
Higher FrontierMath score (26.3% vs 15.8%)
Higher GPQA score (85.7% vs 83.3%)
Higher Humanity's Last Exam score (24.8% vs 14.7%)
Higher MMMU score (84.2% vs 82.9%)
Higher MMMU-Pro score (78.4% vs 76.4%)
Higher Multi-Challenge score (69.6% vs 60.4%)
Higher SWE-Bench Verified score (74.9% vs 69.1%)
Higher Tau2 Retail score (81.1% vs 80.2%)
Higher Tau2 Telecom score (96.7% vs 58.2%)
Higher VideoMMMU score (84.6% vs 83.3%)
OpenAI
Less expensive output tokens
Higher Tau2 Airline score (64.8% vs 62.6%)
OpenAIGPT-5
OpenAIo3
Compare in Playground

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against GPT-5 and o3 side-by-side, then vote on the output you prefer.

GPT-5
✓ Preferred
o3
Open in Playground
AI Model Comparison Table
Feature
OpenAI
GPT-5
OpenAI
o3

FAQ

Common questions about GPT-5 vs o3.

Which is better, GPT-5 or o3?

GPT-5 significantly outperforms across most benchmarks. GPT-5 is made by OpenAI and o3 is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT-5 compare to o3 in benchmarks?

GPT-5 scores SWE-Lancer (IC-Diamond subset): 100.0%, COLLIE: 99.0%, Tau2 Telecom: 96.7%, OpenAI-MRCR: 2 needle 128k: 95.2%, AIME 2025: 94.6%. o3 scores COLLIE: 98.4%, AIME 2024: 91.6%, ARC-AGI: 88.0%, MathVista: 86.8%, AIME 2025: 86.4%.

Is GPT-5 cheaper than o3?

GPT-5 is 1.6x cheaper for input tokens. GPT-5 costs $1.25/M input and $10.00/M output via openai. o3 costs $2.00/M input and $8.00/M output via openai.

What are the context window sizes for GPT-5 and o3?

GPT-5 supports 400K tokens and o3 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-5 and o3?

Key differences include context window (400K vs 200K), input pricing ($1.25 vs $2.00/M). See the full comparison above for benchmark-by-benchmark results.

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