Kimi K2.5 vs Gemini 4 Argon: price, context window and capabilities
Kimi K2.5 (moonshotai/kimi-k2.5) from MoonshotAI and Gemini 4 Argon (google/gemini-4-argon) from Google are both multimodal language models on the OceanToken API. Kimi K2.5 costs less per token than Gemini 4 Argon: $0.60 against $1.80 per 1M input tokens (67% less) and $3.00 against $9.00 per 1M output tokens (67% less). Gemini 4 Argon is 10% off its official price on OceanToken, for every account. Gemini 4 Argon has the larger context window: 1.05M tokens (1,048,576) against 262K (262,144) for Kimi K2.5. Both support tool calling, reasoning, structured outputs and image input; only Gemini 4 Argon also lists file input, audio input and video input.
Side by side
| Spec | Kimi K2.5 | Gemini 4 Argon −10% |
|---|---|---|
| Model | Kimi K2.5moonshotai/ | Gemini 4 Argongoogle/ |
| Publisher | MoonshotAI | |
| Kind | Text & vision | Text, vision, audio & video |
| Context window | 262K tokens262,144 | 1.05M tokens1,048,576 |
| Input price | $0.60 / 1M tokens | $1.80 / 1M tokens |
| Output price | $3.00 / 1M tokens | $9.00 / 1M tokens |
| Cached input price | $0.10 / 1M tokens | $0.10 / 1M tokens |
| Cache write price | – | $2.188 / 1M tokens |
| Web search price | – | $0.014 / search |
| Discount (vs official, top tier) | — | −10% |
| Inputs | text and images | text, images, files, audio and video |
| Outputs | text | text |
| Tool calling | Yes | Yes |
| Reasoning | Yes | Yes |
| Structured outputs | Yes | Yes |
About these prices
Which should you choose?
- Choose Kimi K2.5 to spend less per token: 67% less for input and 67% less for output than Gemini 4 Argon.
- Choose Gemini 4 Argon for the longest inputs: its context window holds 1.05M tokens against 262K for Kimi K2.5.
- Choose Gemini 4 Argon if you need file input, audio input and video input: Kimi K2.5 does not list them.
- Not sure? Call both with the same OceanToken API key and compare them on your own prompts; each request is billed per use from one prepaid balance.
Get API Key Kimi K2.5 Gemini 4 Argon
Frequently asked questions
Which is cheaper, Kimi K2.5 or Gemini 4 Argon?
Kimi K2.5. Kimi K2.5 costs less per token than Gemini 4 Argon: $0.60 against $1.80 per 1M input tokens (67% less) and $3.00 against $9.00 per 1M output tokens (67% less). Gemini 4 Argon is 10% off its official price on OceanToken, for every account. The OceanToken console always shows the current price.
Which has the larger context window, Kimi K2.5 or Gemini 4 Argon?
Gemini 4 Argon. Gemini 4 Argon has the larger context window: 1.05M tokens (1,048,576) against 262K (262,144) for Kimi K2.5.
Can I call both Kimi K2.5 and Gemini 4 Argon with one API key?
Yes. Both are on the OceanToken API at https://api.oceantoken.ai/v1: one API key and one prepaid balance call either model. Send the model id moonshotai/kimi-k2.5 or google/gemini-4-argon.
Models and publishers
Kimi K2.5 · Gemini 4 Argon · All MoonshotAI models · All Google models
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