Claude Sonnet 5 VS Grok 4.5
Anthropic · xAI · AI Models · Updated Sep 27, 2026
Side-by-Side Breakdown
| Feature | Claude Sonnet 5 | Grok 4.5 | Winner |
|---|---|---|---|
| Input Price | $2.00/1M tkns | $1.60/1M tkns | ✓ Grok 4.5 |
| Output Price | $10.00/1M tkns | $4.80/1M tkns | ✓ Grok 4.5 |
| Provider | Anthropic | xAI | — |
| Category | ai-model | ai-model | — |
| context window | 1000000 | 500000 | |
| modalities | text+image+file->text | text+image+file->text | |
| vision | true | true | |
| Overall Winner | 🏆 | Grok 4.5 |
Claude Sonnet 5 vs Grok 4.5: Quick Summary
Grok 4.5 is the more affordable choice. Claude Sonnet 5 costs $2.00/1M tkns vs Grok 4.5 at $1.60/1M tkns (Input Price). Grok 4.5 is 25.0% cheaper. Pricing verified as of Sep 27, 2026 — always confirm on the provider's official pricing page before committing.
Claude Sonnet 5 vs Grok 4.5: Full Pricing Analysis
On headline price, Grok 4.5 is the cheaper option: $1.60/1M tkns versus $2.00/1M tkns for Claude Sonnet 5 (Input Price) — about 20% less. At a scale of one million per 1M tokens, that difference works out to roughly $1,600.00 with Grok 4.5 against $2,000.00 with Claude Sonnet 5. For high-volume workloads that gap compounds quickly, so if your usage is predictable and large, Grok 4.5 is the more economical default.
Price isn’t the whole story, though. Claude Sonnet 5 (Anthropic) sits at the higher price point, which is often justified by broader features, stronger delivery/SLA guarantees, or a more mature developer experience. If you need those capabilities, the premium can pay for itself. Choose Grok 4.5 when cost-per-unit is the priority and your requirements are straightforward; choose Claude Sonnet 5 when reliability, tooling, or ecosystem fit matter more than shaving the per-unit rate.
Beyond price, the two differ on context window (1000000 vs 500000), modalities (text+image+file->text vs text+image+file->text) and vision (true vs true). Check those specs against your actual requirements before committing — the cheaper option is only the better deal if it also meets your technical needs.
Pricing shown is Input Price as published by each provider and verified Sep 27, 2026. Providers change prices and introduce free tiers and volume discounts frequently — always confirm the current rate on Anthropic’s and xAI’s official pricing pages before you commit.