Model Comparison

GPT-5.4 vs GPT-5.5 Instant

Q: Is GPT-5.4 cheaper than GPT-5.5 Instant?

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 Instant costs $5.00/M input and $30.00/M output via openai.

Q: What are the context window sizes for GPT-5.4 and GPT-5.5 Instant?

GPT-5.4 supports 1.0M tokens and GPT-5.5 Instant supports 400K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Q: What are the main differences between GPT-5.4 and GPT-5.5 Instant?

Key differences include context window (1.0M vs 400K), input pricing ($2.50 vs $5.00/M). See the full comparison above for benchmark-by-benchmark results.

GPT-5.4 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

3 benchmarks

GPT-5.4 outperforms in 3 benchmarks (GPQA, MMMU-Pro, OmniDocBench 1.5), while GPT-5.5 Instant is better at 0 benchmarks.

GPT-5.4 significantly outperforms across most benchmarks.

Wed May 06 2026 • llm-stats.com

Arena Performance

Human preference votes

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 Instant ($5.00/1M tokens).

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

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

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

Lowest available price from all providers

Wed May 06 2026 • llm-stats.com

GPT-5.4

Input tokens$2.50

Output tokens$15.00

Best providerOpenAI

GPT-5.5 Instant

Input tokens$5.00

Output tokens$30.00

Best providerOpenAI

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Context Window

Maximum input and output token capacity

GPT-5.4 accepts 1,000,000 input tokens compared to GPT-5.5 Instant's 400,000 tokens. Both models can generate responses up to 128,000 tokens.

GPT-5.4

Input1,000,000 tokens

Output128,000 tokens

GPT-5.5 Instant

Input400,000 tokens

Output128,000 tokens

Wed May 06 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both GPT-5.4 and GPT-5.5 Instant 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 Instant

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 Instant

Proprietary

Closed source

Release Timeline

When each model was launched

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

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

GPT-5.4

Mar 5, 2026

2 months ago

GPT-5.5 Instant

May 5, 2026

1 days ago

2mo newer

Knowledge Cutoff

When training data ends

GPT-5.5 Instant has a documented knowledge cutoff of 2025-08-31, while GPT-5.4's cutoff date is not specified.

We can confirm GPT-5.5 Instant's training data extends to 2025-08-31, but cannot make a direct comparison without GPT-5.4's cutoff date.

GPT-5.4

—

GPT-5.5 Instant

Aug 2025

Provider Availability

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

GPT-5.4

OpenAI

Input Price:Input: $2.50/1MOutput Price:Output: $15.00/1M

GPT-5.5 Instant

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

GPT-5.4

View details

OpenAI

Larger context window (1,000,000 tokens)

Less expensive input tokens

Less expensive output tokens

Higher GPQA score (92.8% vs 85.6%)

Higher MMMU-Pro score (81.2% vs 76.0%)

Higher OmniDocBench 1.5 score (89.1% vs 87.5%)

GPT-5.5 Instant

View details

OpenAI

No standout differentiators in the data we have for this pair.

Detailed Comparison

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

FAQ

Common questions about GPT-5.4 vs GPT-5.5 Instant.

Which is better, GPT-5.4 or GPT-5.5 Instant?

GPT-5.4 significantly outperforms across most benchmarks. GPT-5.4 is made by OpenAI and GPT-5.5 Instant is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does GPT-5.4 compare to GPT-5.5 Instant in benchmarks?

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 Instant scores HealthBench Consensus: 94.7%, OmniDocBench 1.5: 87.5%, GPQA: 85.6%, CharXiv-R: 81.6%, AIME 2025: 81.2%.

Is GPT-5.4 cheaper than GPT-5.5 Instant?

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 Instant costs $5.00/M input and $30.00/M output via openai.

What are the context window sizes for GPT-5.4 and GPT-5.5 Instant?

GPT-5.4 supports 1.0M tokens and GPT-5.5 Instant supports 400K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT-5.4 and GPT-5.5 Instant?

Key differences include context window (1.0M vs 400K), input pricing ($2.50 vs $5.00/M). See the full comparison above for benchmark-by-benchmark results.