Claude Sonnet 5.5 vs Grok 4.7: pricing and benchmarks
Both charge $2.00 per 1M input tokens. Grok 4.7 is 40% cheaper on output tokens ($6.00 vs $10.00 per 1M). On our document Q&A workload (50,000 questions a month), Grok 4.7 costs $980.00 a month versus $1,100 for Claude Sonnet 5.5, 11% less. Epoch AI has not published a capability index score for Claude Sonnet 5.5 and Grok 4.7 yet.
Prices verified September 28, 2026.
Which should you choose?
Epoch AI has not published a capability index score for Claude Sonnet 5.5 and Grok 4.7 yet.
Grok 4.7 costs $3.00 per 1M tokens (3:1 input-to-output mix) vs $4.00 for Claude Sonnet 5.5, 25% less.
Pricing and specs
| Claude Sonnet 5.5 | Grok 4.7 | |
|---|---|---|
| Provider | Anthropic | xAI |
| API model ID | claude-sonnet-5-5 | grok-4.7 |
| Input / 1M tokens | $2.00 | $2.00 |
| Cached input / 1M tokens | $0.20 | $0.50 |
| Output / 1M tokens | $10.00 | $6.00 |
| Long-context rates | — | $4.00 in / $12.00 out above 200K prompt tokens |
| Context window | 1M tokens | 500K tokens |
| Max output | 128K tokens | — |
| Batch discount | 50% off | — |
Monthly cost for real workloads
| Workload | Claude Sonnet 5.5 | Grok 4.7 | Difference |
|---|---|---|---|
Support chatbot 100,000 replies a month, ~1,500 input tokens (system prompt + history) and ~400 output tokens each. | $700.00 | $540.00 | Grok 4.7 23% cheaper |
Document Q&A (RAG) 50,000 questions a month with ~8,000 tokens of retrieved context and ~600 output tokens each. | $1,100 | $980.00 | Grok 4.7 11% cheaper |
Coding agent 10,000 agent steps a month, ~40,000 input tokens each (70% read from the prompt cache) and ~2,000 output tokens. | $496.00 | $500.00 | Claude Sonnet 5.5 1% cheaper |
Estimates use standard list prices and ignore cache-write surcharges. Different tokenizers can count the same text differently, so test with your own prompts.
Claude Sonnet 5.5 vs Grok 4.7 cost calculator
- $980.00/mo$0.02 / request
- Claude Sonnet 5.5Anthropic$1,100/mo$0.02 / request
Standard-tier list prices. Long-context rates apply automatically where the provider publishes a threshold. Excludes cache-write surcharges, taxes, batch and volume discounts.
Claude Sonnet 5.5 pricing notes
Anthropic’s fast mid-tier model, successor to Claude Sonnet 5 at the same price.
- Cache writes cost $2.50 (5-minute cache) or $4 (1-hour cache) per 1M tokens.
- US-only inference (inference_geo: "us") costs 1.1x.
Grok 4.7 pricing notes
xAI’s newest flagship for coding and general use, with agentic tool calling and configurable reasoning.
- Requests with 200K or more prompt tokens are billed at $4 input / $1 cached / $12 output for all tokens.
- Web Search costs $5 per 1,000 calls; X Search is billed per item fetched, at $5 per 1,000 posts and $10 per 1,000 user profiles.
Frequently asked questions
- Is Claude Sonnet 5.5 cheaper than Grok 4.7?
- Both charge $2.00 per 1M input tokens. Grok 4.7 is 40% cheaper on output tokens ($6.00 vs $10.00 per 1M). On our document Q&A workload (50,000 questions a month), Grok 4.7 costs $980.00 a month versus $1,100 for Claude Sonnet 5.5, 11% less.
- Which is more capable, Claude Sonnet 5.5 or Grok 4.7?
- Epoch AI has not published a capability index score for Claude Sonnet 5.5 and Grok 4.7 yet.
- How much does Claude Sonnet 5.5 cost per 1M tokens?
- Claude Sonnet 5.5 costs $2.00 per 1M input tokens and $10.00 per 1M output tokens, and $0.20 per 1M cached input tokens on Anthropic’s standard tier.
- How much does Grok 4.7 cost per 1M tokens?
- Grok 4.7 costs $2.00 per 1M input tokens and $6.00 per 1M output tokens, and $0.50 per 1M cached input tokens on xAI’s standard tier.
- Which has the larger context window, Claude Sonnet 5.5 or Grok 4.7?
- Claude Sonnet 5.5 has the larger context window: 1M tokens versus 500K for Grok 4.7.