Claude Opus 5.5 vs Grok 4.6: price, context window and capabilities
Claude Opus 5.5 (anthropic/claude-opus-5.5) from Anthropic and Grok 4.6 (x-ai/grok-4.6) from SpaceXAI are both multimodal language models on the OceanToken API. Grok 4.6 costs less per token than Claude Opus 5.5: $2.00 against $3.60 per 1M input tokens (44% less) and $6.00 against $18.00 per 1M output tokens (67% less). Claude Opus 5.5 is 10% off its official price on OceanToken, for every account. Claude Opus 5.5 has the larger context window: 1M tokens (1,000,000) against 500K (500,000) for Grok 4.6. Both support tool calling, reasoning, structured outputs, image input and file input.
Side by side
| Spec | Claude Opus 5.5 −10% | Grok 4.6 |
|---|---|---|
| Model | Claude Opus 5.5anthropic/ | Grok 4.6x- |
| Publisher | Anthropic | SpaceXAI |
| Kind | Text & vision | Text & vision |
| Context window | 1M tokens1,000,000 | 500K tokens500,000 |
| Input price | $3.60 / 1M tokens | $2.00 / 1M tokens |
| Output price | $18.00 / 1M tokens | $6.00 / 1M tokens |
| Cached input price | $0.20 / 1M tokens | $0.50 / 1M tokens |
| Cache write price | $5.00 / 1M tokens | – |
| Web search price | $0.01 / search | $0.005 / search |
| Discount (vs official, top tier) | −10% | — |
| Inputs | text, images and files | text, images and files |
| Outputs | text | text |
| Tool calling | Yes | Yes |
| Reasoning | Yes | Yes |
| Structured outputs | Yes | Yes |
About these prices
Which should you choose?
- Choose Grok 4.6 to spend less per token: 44% less for input and 67% less for output than Claude Opus 5.5.
- Choose Claude Opus 5.5 for the longest inputs: its context window holds 1M tokens against 500K for Grok 4.6.
- Both list the same capabilities: tool calling, reasoning, structured outputs, image input and file input.
- 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 Claude Opus 5.5 Grok 4.6
Frequently asked questions
Which is cheaper, Claude Opus 5.5 or Grok 4.6?
Grok 4.6. Grok 4.6 costs less per token than Claude Opus 5.5: $2.00 against $3.60 per 1M input tokens (44% less) and $6.00 against $18.00 per 1M output tokens (67% less). Claude Opus 5.5 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, Claude Opus 5.5 or Grok 4.6?
Claude Opus 5.5. Claude Opus 5.5 has the larger context window: 1M tokens (1,000,000) against 500K (500,000) for Grok 4.6.
Can I call both Claude Opus 5.5 and Grok 4.6 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 anthropic/claude-opus-5.5 or x-ai/grok-4.6.
Models and publishers
Claude Opus 5.5 · Grok 4.6 · All Anthropic models · All SpaceXAI models
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