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Model Comparison

GPT-5.4 vs GPT-5.5

GPT-5.5 significantly outperforms across most benchmarks. GPT-5.4 is 2.0x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

16 benchmarks

GPT-5.4 outperforms in 2 benchmarks (FrontierMath, Tau2 Telecom), while GPT-5.5 is better at 14 benchmarks (ARC-AGI, ARC-AGI v2, BrowseComp, Finance Agent, GPQA, Graphwalks BFS >128k, Graphwalks parents >128k, Humanity's Last Exam, MCP Atlas, MMMU-Pro, OSWorld-Verified, SWE-Bench Pro, Terminal-Bench 2.0, Toolathlon).

GPT-5.5 significantly outperforms across most benchmarks.

Thu Apr 23 2026 • llm-stats.com

Arena Performance

Human preference votes

CallingBox

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Pricing Analysis

Price comparison per million tokens

GPT-5.4 costs less

For input processing, GPT-5.4 ($2.50/1M tokens) is 2.0x cheaper than GPT-5.5 ($5.00/1M tokens).

For output processing, GPT-5.4 ($15.00/1M tokens) is 2.0x cheaper than GPT-5.5 ($30.00/1M tokens).

In conclusion, GPT-5.5 is more expensive than GPT-5.4.*

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

Lowest available price from all providers
Thu Apr 23 2026 • llm-stats.com
OpenAI
GPT-5.4
Input tokens$2.50
Output tokens$15.00
Best providerOpenAI
OpenAI
GPT-5.5
Input tokens$5.00
Output tokens$30.00
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 1,000,000 tokens. Both models can generate responses up to 128,000 tokens.

OpenAI
GPT-5.4
Input1,000,000 tokens
Output128,000 tokens
OpenAI
GPT-5.5
Input1,000,000 tokens
Output128,000 tokens
Thu Apr 23 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both GPT-5.4 and GPT-5.5 support multimodal inputs.

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

GPT-5.4

Text
Images
Audio
Video

GPT-5.5

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-5.4

Proprietary

Closed source

GPT-5.5

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-5.4 was released on 2026-03-05, while GPT-5.5 was released on 2026-04-23.

GPT-5.5 is 2 months newer than GPT-5.4.

GPT-5.4

Mar 5, 2026

1 months ago

GPT-5.5

Apr 23, 2026

0 days ago

1mo newer

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-5.4 is available from OpenAI. GPT-5.5 is available from OpenAI.

GPT-5.4

openai logo
OpenAI
Input Price:Input: $2.50/1MOutput Price:Output: $15.00/1M

GPT-5.5

openai logo
OpenAI
Input Price:Input: $5.00/1MOutput Price:Output: $30.00/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

OpenAI
Less expensive input tokens
Less expensive output tokens
Higher FrontierMath score (47.6% vs 35.4%)
Higher Tau2 Telecom score (98.9% vs 98.0%)
OpenAI
Higher ARC-AGI score (95.0% vs 93.7%)
Higher ARC-AGI v2 score (85.0% vs 73.3%)
Higher BrowseComp score (84.4% vs 82.7%)
Higher Finance Agent score (60.0% vs 56.0%)
Higher GPQA score (93.6% vs 92.8%)
Higher Graphwalks BFS >128k score (45.4% vs 21.4%)
Higher Graphwalks parents >128k score (58.5% vs 32.4%)
Higher Humanity's Last Exam score (52.2% vs 39.8%)
Higher MCP Atlas score (75.3% vs 67.2%)
Higher MMMU-Pro score (83.2% vs 81.2%)
Higher OSWorld-Verified score (78.7% vs 75.0%)
Higher SWE-Bench Pro score (58.6% vs 57.7%)
Higher Terminal-Bench 2.0 score (82.7% vs 75.1%)
Higher Toolathlon score (55.6% vs 54.6%)

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
GPT-5.4
OpenAI
GPT-5.5

FAQ

Common questions about GPT-5.4 vs GPT-5.5

GPT-5.5 significantly outperforms across most benchmarks. GPT-5.4 is made by OpenAI and GPT-5.5 is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
GPT-5.4 scores Tau2 Telecom: 98.9%, ARC-AGI: 93.7%, Graphwalks BFS <128k: 93.0%, GPQA: 92.8%, Graphwalks parents <128k: 89.8%. GPT-5.5 scores Tau2 Telecom: 98.0%, ARC-AGI: 95.0%, GPQA: 93.6%, ARC-AGI v2: 85.0%, GDPval-MM: 84.9%.
GPT-5.4 is 2.0x cheaper for input tokens. GPT-5.4 costs $2.50/M input and $15.00/M output via openai. GPT-5.5 costs $5.00/M input and $30.00/M output via openai.
GPT-5.4 supports 1.0M tokens and GPT-5.5 supports 1.0M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include input pricing ($2.50 vs $5.00/M). See the full comparison above for benchmark-by-benchmark results.