# Anthropic vs xAI

> Two closed labs with different bets: Anthropic on agentic coding and flat 1M pricing, xAI on cheap output tokens and live data from X. Long contexts expose the biggest pricing difference.

Canonical: https://www.subconscious.dev/compare/anthropic-vs-xai · By The Subconscious Team · Updated September 30, 2026

## How they compare

Anthropic and xAI both sell closed models through first-party APIs, but their pricing handles long prompts very differently. Claude's top three tiers carry 1M context at standard rates with no surcharge past 200K. xAI's Grok 4.6 has a 500K window at $2 in and $6 out, and once a prompt hits 200K tokens the whole request bills at double. Older Grok 4.20 and 4.3 keep 1M context at $1.25 in and $2.50 out. On output-heavy work, xAI is much cheaper than Anthropic at comparable tiers, while Fable 5.1 always thinks and runs up output tokens.

xAI's distinct asset is data, not price. Server-side Web Search and X Search pull current posts straight from X, which suits news, market and social-sentiment agents. Anthropic's is coding: top SWE-bench Pro results, Claude Code's adoption, and availability on Bedrock, Vertex AI and Microsoft Foundry, where xAI has a smaller enterprise footprint and fewer marketplace options. xAI also has separate first-party APIs for image, video and audio. Long repo-scale agents fit Claude better. Fresh-data and cost-first reasoning tasks fit Grok.

## What each one does

### Anthropic

Anthropic sells the Claude family of closed models through its own API, Amazon Bedrock, Google Vertex AI and Microsoft Foundry. The public lineup today runs from Claude Fable 5.1 at the top, released September 1, 2026, through the Opus and Sonnet tiers down to Haiku 4.5. List prices span a tenfold range, from $10 in and $50 out on Fable to $1 in and $5 out on Haiku. The top three tiers include a 1M token context window at standard pricing with no surcharge past 200K.

### xAI

xAI sells the Grok models through its own API. Grok 4.6 is the current flagship and xAI tells developers to use it for everything outside audio, image and video, code included. It has a 500K context window and costs $2 in and $6 out per million tokens under 200K prompt tokens. Older Grok 4.20 and 4.3 models keep a 1M window at $1.25 in and $2.50 out, which is aggressive for that capability class.

## Which is best, and when

### Choose Anthropic for

- Agent contexts past 200K without a doubling surcharge
- Enterprise buyers who need the model on major clouds
- Agentic coding and code review

### Choose xAI for

- Social listening and news agents that need live X data
- Output-heavy reasoning where cheaper tokens matter
- Teams that also want first-party image, video and audio APIs

## At a glance

| Attribute | Anthropic | xAI |
|---|---|---|
| Model access | Closed | Closed |
| Flagship models | Claude Fable 5.1, Opus, Sonnet, Haiku 4.5 | Grok 4.6, Grok 4.20, grok-build |
| Speed | Fable is the slowest tier | ~54 tok/s on Grok 4.6 |
| Price | $1–$10 in, $5–$50 out per 1M | $2 in, $6 out (Grok 4.6); 2x past 200K |
| Customization | N/A | - |
| Deployment | API, Bedrock, Vertex AI, Microsoft Foundry | First-party API |
| Long context | 1M, no surcharge past 200K | 500K (4.6), 1M (4.20, 4.3) |

## FAQ

### What is the difference between Anthropic and xAI?

Two closed labs with different bets: Anthropic on agentic coding and flat 1M pricing, xAI on cheap output tokens and live data from X. Long contexts expose the biggest pricing difference.

### When should I choose Anthropic over xAI?

Agent contexts past 200K without a doubling surcharge; Enterprise buyers who need the model on major clouds; Agentic coding and code review.

### When should I choose xAI over Anthropic?

Social listening and news agents that need live X data; Output-heavy reasoning where cheaper tokens matter; Teams that also want first-party image, video and audio APIs.

### Is Anthropic or xAI cheaper?

Anthropic: $1–$10 in, $5–$50 out per 1M. xAI: $2 in, $6 out (Grok 4.6); 2x past 200K. The cheaper choice depends on the model and workload.

### Which has more context, Anthropic or xAI?

Anthropic: 1M, no surcharge past 200K. xAI: 500K (4.6), 1M (4.20, 4.3).

## Running long-horizon agents?

If your agents run past 200K tokens, compare both against Subconscious: [Subconscious vs Anthropic](https://www.subconscious.dev/compare/subconscious-vs-anthropic.md), [Subconscious vs xAI](https://www.subconscious.dev/compare/subconscious-vs-xai.md).

Full profiles: [Anthropic](https://www.subconscious.dev/providers/anthropic.md), [xAI](https://www.subconscious.dev/providers/xai.md).