# Claude Sonnet 5.5 vs Gemini 4 Argon

As of October 21, 2026, Claude Sonnet 5.5 and Gemini 4 Argon cost the same: $2.00 per 1M input tokens and $10.00 per 1M output tokens. Gemini 4 Argon has the larger context window: 1,048,576 tokens versus 1,000,000. Gemini 4 Argon's price is introductory through November 30, 2026.

- Page: https://models.litellm.ai/compare/claude-sonnet-5-5-vs-gemini-4-argon
- Claude Sonnet 5.5: https://models.litellm.ai/models/claude-sonnet-5-5
- Gemini 4 Argon: https://models.litellm.ai/models/gemini-4-argon

## Side by side

| | Claude Sonnet 5.5 | Gemini 4 Argon |
|---|---|---|
| Input, per 1M tokens | $2.00 | $2.00 |
| Output, per 1M tokens | $10.00 | $10.00 |
| Cache read, per 1M tokens | $0.10 | $0.10 |
| Cache write, per 1M tokens | $2.50 | – |
| Context window | 1,000,000 tokens | 1,048,576 tokens |
| Max output | 128,000 tokens | 1,048,576 tokens |
| Image input | Yes | Yes |
| Tool calling | Yes | Yes |
| Structured output (JSON) | Yes | Yes |
| Prompt caching | Yes | Yes |
| Reasoning | Yes | Yes |
| Providers on LiteLLM | 7 | 3 |
| Price shown is from | Anthropic | Google AI Studio, introductory until November 30, 2026 |
| Added to LiteLLM | September 28, 2026 | October 13, 2026 |

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

## Cheapest provider for each

- Claude Sonnet 5.5: Anthropic at $2.00 input per 1M tokens (`claude-sonnet-5-5`)
- Gemini 4 Argon: Google AI Studio at $2.00 input per 1M tokens (`gemini/gemini-4-argon`)

## Benchmark scores

| Benchmark | Claude Sonnet 5.5 | Gemini 4 Argon |
|---|---|---|
| Epoch Capabilities Index (Overall) | 166.2 | 166.4 |
| FrontierCode (Coding and agents) | 52.1% (xhigh) | 47.5% (medium) |
| FrontierSWE (Coding and agents) | 61.9% (max) | 55.0% (high) |
| APEX-Agents (Coding and agents) | 75.5% (max) | 82.4% |
| GPQA Diamond (Reasoning and knowledge) | 95.6% (max) | 96.4% (high) |
| SimpleQA Verified (Reasoning and knowledge) | 46.5% (max) | 76.0% (high) |
| FrontierMath (tiers 1-3) (Math) | 88.8% (max) | 86.0% (high) |
| FrontierMath (tier 4) (Math) | 80.5% (max) | 78.0% (high) |
| OTIS Mock AIME 2024-2025 (Math) | 100.0% (max) | 100.0% (high) |

From the Epoch AI Benchmarking Hub (https://epoch.ai/benchmarks), CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/), data as of October 13, 2026: Epoch's own runs and results it collects from each benchmark's leaderboard. Higher is better.

## When to pick which

- Claude Sonnet 5.5: Available from 7 providers through LiteLLM, vs 3.
- Gemini 4 Argon: Returns up to 1,048,576 tokens per response, vs 128,000.

## FAQ

### Which is cheaper, Claude Sonnet 5.5 or Gemini 4 Argon?

They cost the same: $2.00 per 1M input tokens and $10.00 per 1M output tokens, as of October 21, 2026.

### Which has the larger context window, Claude Sonnet 5.5 or Gemini 4 Argon?

Gemini 4 Argon has the larger context window: 1,048,576 tokens, versus 1,000,000 for Claude Sonnet 5.5.

### Can I switch from Claude Sonnet 5.5 to Gemini 4 Argon without changing my code?

Yes. Through LiteLLM both use the OpenAI format, so switching means changing the model name from "claude-sonnet-5-5" to "gemini/gemini-4-argon", or pointing a LiteLLM gateway model alias at the other model. You can also use one as a fallback for the other.