# GPT-5.4 vs GPT-5.5

As of November 10, 2026, GPT-5.5 costs 100% more per input token than GPT-5.4 ($5.00 vs $2.50 per 1M), and both have a 1M-token context window.

- Page: https://models.litellm.ai/compare/gpt-5.4-vs-gpt-5.5
- GPT-5.4: https://models.litellm.ai/models/gpt-5.4
- GPT-5.5: https://models.litellm.ai/models/gpt-5.5

## Side by side

| | GPT-5.4 | GPT-5.5 |
|---|---|---|
| Input, per 1M tokens | $2.50 | $5.00 |
| Output, per 1M tokens | $15.00 | $30.00 |
| Cache read, per 1M tokens | $0.25 | $0.50 |
| Cache write, per 1M tokens | – | – |
| Context window | 1,050,000 tokens | 1,050,000 tokens |
| Max output | 128,000 tokens | 128,000 tokens |
| Image input | Yes | Yes |
| Tool calling | Yes | Yes |
| Structured output (JSON) | Yes | Yes |
| Prompt caching | Yes | Yes |
| Reasoning | Yes | Yes |
| Providers on LiteLLM | 10 | 11 |
| Price shown is from | OpenAI | OpenAI |
| Added to LiteLLM | March 2026 | April 2026 |

Headline prices in USD per 1M tokens, from LiteLLM's model price file.

## Cheapest provider for each

- GPT-5.4: Databricks at $2.50 input per 1M tokens (`databricks/databricks-gpt-5-4`)
- GPT-5.5: OpenAI at $5.00 input per 1M tokens (`gpt-5.5`)

## Benchmark scores

| Benchmark | GPT-5.4 | GPT-5.5 |
|---|---|---|
| Epoch Capabilities Index (Overall) | 157.8 | 160.1 |
| Terminal-Bench (Coding and agents) | 81.8% | 84.7% |
| APEX-Agents (Coding and agents) | 52.4% | 55.1% |
| GPQA Diamond (Reasoning and knowledge) | 93.3% (xhigh) | 90.7% (low) |
| ARC-AGI-2 (Reasoning and knowledge) | 74.0% (xhigh) | 85.0% (xhigh) |
| SimpleQA Verified (Reasoning and knowledge) | 45.1% (xhigh) | 63.0% (xhigh) |
| FrontierMath (tiers 1-3) (Math) | 78.6% (xhigh) | 85.3% (xhigh) |
| FrontierMath (tier 4) (Math) | 49.0% (xhigh) | 72.5% (xhigh) |
| OTIS Mock AIME 2024-2025 (Math) | 97.8% (high) | 84.4% (low) |

From the Epoch AI Benchmarking Hub (https://epoch.ai/benchmarks), CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/), data as of August 27, 2026: Epoch's own runs and results it collects from each benchmark's leaderboard. Higher is better.

## When to pick which

- GPT-5.4: Costs 50% less per input token: $2.50 vs $5.00 per 1M.

## FAQ

### Which is cheaper, GPT-5.4 or GPT-5.5?

GPT-5.4 is cheaper at 3 input tokens per output token: $5.625 per 1M tokens blended ($2.50 input, $15.00 output), versus $11.25 ($5.00 and $30.00) for GPT-5.5, as of November 10, 2026.

### Which has the larger context window, GPT-5.4 or GPT-5.5?

Both have a 1,050,000-token context window.

### Can I switch from GPT-5.4 to GPT-5.5 without changing my code?

Yes. Through LiteLLM both use the OpenAI format, so switching means changing the model name from "gpt-5.4" to "gpt-5.5", or pointing a LiteLLM gateway model alias at the other model. You can also use one as a fallback for the other.