Anthropic: Claude Sonnet 4.5 vs xAI: Grok 3
Side-by-side specs, pricing, and benchmarks. Pick a winner for your team's use case.
Use it in a Space
Spin up a Switchy Space with either model — your whole team @-mentions it with shared context, pooled credits, one memory.
Anthropic: Claude Sonnet 4.5xAI: Grok 3
Input $/Mtok$3.00 · $3.00
Output $/Mtok$15.00 · $15.00
Anthropic: Claude Sonnet 4.5xAI: Grok 3
Anthropic: Claude Sonnet 4.51000K tokens
xAI: Grok 3131K tokens
Bars use square-root scaling so a 1M-token window doesn't crush a 200K one.
Anthropic: Claude Sonnet 4.5xAI: Grok 3
2025-09-29
2025-06-10
2025-05-11today
Anthropic: Claude Sonnet 4.5
- Provider
- anthropic
- Context
- 1000k
- Input $/Mtok
- $3.00
- Output $/Mtok
- $15.00
- Max output
- 64000
- Modalities
- text, image, file
xAI: Grok 3
- Provider
- x-ai
- Context
- 131k
- Input $/Mtok
- $3.00
- Output $/Mtok
- $15.00
- Max output
- —
- Modalities
- text
Price delta
Anthropic: Claude Sonnet 4.5 and xAI: Grok 3 charge the same on input tokens. Output: same price on both sides.
Which to pick
Pick **Claude Sonnet 4.5** for general-purpose team work — coding, writing, structured reasoning, multi-step planning. Sonnet leads Grok 3 on most reasoning and code evals, the 200k-token context comfortably exceeds Grok's 131k, and Anthropic's tool-use ergonomics are more predictable in long multi-turn chats. Pricing is identical at $3 in / $15 out per Mtok, so the choice rarely comes down to cost.
Pick **Grok 3** when you specifically want X / xAI's tone, real-time signal access, or have a workflow that benefits from Grok's particular search integration. On pure model quality the gap favours Sonnet, but Grok's strengths are stylistic and ecosystem-shaped, not benchmark-shaped.