Claude Sonnet 5 vs Grok 4.5

Claude Sonnet 5 is Anthropic's generally available mid-tier flagship, priced at $2 input and $10 output per million tokens through August 2026, rising to $3 and $15 on September 1, 2026. xAI released Grok 4.5 on July 8, 2026 for coding, agentic tasks, and knowledge work, but had not published per-token pricing as of this writing.

Sonnet 5 is built for multi-agent, enterprise-scale professional work. Grok 4.5 leans on broad platform integrations, including Databricks and Amazon Bedrock, for agentic task management.

This page compares price, availability, and compliance so you can pick the right model for your workload.

Claude Sonnet 5 vs. Grok 4.5: Side-by-Side

Price: Sonnet 5's cost is documented, Grok 4.5's isn't yet

Claude Sonnet 5 costs $2 input and $10 output per million tokens through August 2026, moving to $3 and $15 on September 1, 2026 (Anthropic) — a clear, published number to budget against.

xAI has not published official per-token pricing for Grok 4.5 as of this writing. Its predecessor Grok 4.3 was priced at $1.25 input and $2.50 output per million tokens, well below Sonnet 5. Confirm current Grok 4.5 pricing directly with xAI before budgeting.

• Claude Sonnet 5: $2/$10 through Aug 2026, then $3/$15 from Sep 1, 2026.
• Grok 4.5: pricing not yet published.
• Grok 4.3 (prior flagship): $1.25 / $2.50 per million tokens.

→ Compare per-token pricing for every AI model

Best-fit work: multi-agent scale vs platform integrations

Claude Sonnet 5 is tuned for multi-agent, enterprise-scale professional work. Grok 4.5 is built for coding, agentic tasks, and knowledge work, with broad platform integrations including Databricks and Amazon Bedrock.

If your team already runs on Databricks or Amazon Bedrock, Grok 4.5's integrations are a real practical advantage. If you're standardized on Anthropic's ecosystem and need documented, stable pricing, Sonnet 5 is the more predictable choice.

• Sonnet 5: multi-agent, enterprise-scale work, documented pricing.
• Grok 4.5: agentic tasks with Databricks/Bedrock integrations.

Claude Sonnet 5 vs Grok 4.5 benchmarks: what's actually published

Neither Claude Sonnet 5's nor Grok 4.5's maker has published a same-day, apples-to-apples benchmark suite pitting these two exact versions against each other, so treat any comparison here as directional rather than a verified head-to-head.

Vendors have not published a directly comparable, head-to-head SWE-bench Verified score for these exact current-generation versions as of this writing. The most recent published reference points are Claude Opus 4.8 at about 88.6%, GPT-5 at about 74%, Grok 4 at about 75%, and Gemini 2.5 Pro at about 71% (Google) — treat these as directional, not a same-generation apples-to-apples test.

Until both vendors publish a matched benchmark run, the more reliable signal is a short pilot on your own tasks — coding, drafting, or analysis representative of your real workload.

• Claude Opus 4.8: ~88.6% on SWE-bench Verified.
• GPT-5: ~74% on SWE-bench Verified.
• Grok 4: ~75% on SWE-bench Verified.
• Gemini 2.5 Pro: ~71% on SWE-bench Verified.

Compliance: Sonnet 5 has documented coverage today

Claude Sonnet 5 inherits Anthropic's SOC 2, ISO 27001, and HIPAA BAA coverage on the API and Enterprise plans.

Grok 4.5's certification status was not detailed in public materials reviewed for this comparison. Confirm SOC 2 status and HIPAA BAA availability directly with xAI before sending regulated data.

• Sonnet 5: SOC 2, ISO 27001, HIPAA BAA.
• Grok 4.5: confirm current certifications directly with xAI.

How to choose for your business

Choose Claude Sonnet 5 if you need documented pricing, documented compliance, and multi-agent scale today. Choose Grok 4.5 if your stack runs on Databricks or Amazon Bedrock and you want to evaluate a new, potentially lower-cost model.

Run a short pilot on real tasks before committing budget to Grok 4.5, given its pricing and certifications were not fully public at the time of writing.

• Documented pricing and compliance today: Claude Sonnet 5.
• Databricks/Bedrock-native stack, evaluating a new model: Grok 4.5.

The Verdict

Claude Sonnet 5 is the lower-risk pick today: documented pricing, documented compliance, and a mature Anthropic ecosystem. Grok 4.5 brings strong platform-integration claims but pricing and certifications were not fully public at the time of writing.

If your business already runs on Databricks or Amazon Bedrock, pilot Grok 4.5 directly. Otherwise, Claude Sonnet 5's clarity on cost and compliance makes it the safer default.