Claude Opus 4.8 vs Grok 4.3
API pricing, context window and capabilities for Claude Opus 4.8 and Grok 4.3, side by side. Prices are the cheapest listed serving route per 1M tokens, from LiteLLM and OpenRouter.
Verdict
computed from the published numbersClaude Opus 4.8 wins on Terminal-Bench and on intelligence. Grok 4.3 wins on price.
Price
Grok 4.3
Terminal-Bench
Claude Opus 4.8
Intelligence
Claude Opus 4.8
Context window
Tied
Key takeaways
who wins on what, from the published numbersClaude Opus 4.8 wins
- More serving providers (8 vs 6)
Grok 4.3 wins
- Cheaper input ($5.00 vs $1.25 /1M)
- Cheaper output ($25.00 vs $2.50 /1M)
- Higher max output (128K vs 1M)
Cheaper overall
Grok 4.3
$1.25 + $2.50 /1M
Larger context
Tied
More providers
Claude Opus 4.8
8 providers
Pricing & specs
cheapest listed route · per 1M tokensOn-demand listed rates, OpenRouter routed quotes and Vercel reseller quotes. Enterprise commitments can be materially lower.
| Claude Opus 4.8 | Grok 4.3 | |
|---|---|---|
| Input $/1M | $5.00via Anthropic | $1.25via xAI best |
| Output $/1M | $25.00via Anthropic | $2.50via xAI best |
| Context window | 1M | 1M |
| Max output | 128K | 1M best |
| Serving providers | 8 best | 6 |
| Date | Released May 28, 2026 | Released Apr 18, 2026 |
Benchmarks
Benchmark scores, side by side| Claude Opus 4.8 | Grok 4.3 | |
|---|---|---|
| Intelligence | 41.8 best | 24.9 |
| Terminal-Bench | 85% best | 40% |
| GPQA Diamond | 92% best | 90% |
| Output speed | 62 t/s | 113 t/s best |
| Latency (TTFT) | 56.16s | 27.23s best |
Cost calculator
choose a serving route for each sideInput tokens / month
Output tokens / month
Claude Opus 4.8
via Azure
$50
Grok 4.3
via OpenRouter
$8.75
Capabilities
feature support, side by side| Feature | Claude Opus 4.8 | Grok 4.3 |
|---|---|---|
| Vision | ✓ | ✓ |
| Tool use | ✓ | ✓ |
| Reasoning | ✓ | ✓ |
| Audio | — | — |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | ✓ |
| Web search | ✓ | ✓ |
Related comparisons
Frequently asked questions
Which is cheaper, Claude Opus 4.8 or Grok 4.3?
Grok 4.3 is cheaper for input ($5.00 vs $1.25 per 1M tokens) from xAI. Grok 4.3 is cheaper for output ($25.00 vs $2.50 per 1M tokens) from xAI.
What is the context window difference between Claude Opus 4.8 and Grok 4.3?
Both Claude Opus 4.8 and Grok 4.3 have about a 1M-token context window.
How do Claude Opus 4.8 and Grok 4.3 compare on benchmarks?
On the tracked benchmarks, Claude Opus 4.8 leads on Terminal-Bench, and Claude Opus 4.8 leads on intelligence.
Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026
Every weekday
AI moves fast. Here's your debrief.
News, analysis, tools, and more.
For people who build with AI