Claude Opus 5 vs Grok 4.3
Select two models to compare their coding performance, pricing, and features.
Key Takeaways
| Metric | Claude Opus 5 | Grok 4.3 |
|---|---|---|
| Coding Index | 112.64 | — Score awaiting verification |
| Coding tier | S | — |
| Input Price | $5/1M | $1.25/1M |
| Output Price | $25/1M | $2.5/1M |
| Context Window | 1M | 1M |
DeepSeek V4 Flash 0731 = 100. The index reflects two shared tests, not capability multiples or statistically established gaps.
Verdict
Models awaiting tier review remain in the catalog. An unassigned tier does not mean weaker capability.
Capabilities & Use Cases Comparison
Claude Opus 5 Tier S
Grok 4.3 Tier —
- •Reasoning tasks
- •Creative coding
- •Problem decomposition
- •Full-stack development
- •Strong reasoning capability
- •Good at creative coding
- •Large context window
- •Competitive pricing
Claude Opus 5
Benchmark evidence and ranking method · Claude Opus 5
Cross-checked
Terminal-Bench 4.0 · Claude Code · max: 51.82% · 95% CI ± 3.39%
Artificial Analysis · Claude Opus 5 (Adaptive Reasoning, Max Effort)
Test configuration: max
Terminal-Bench 2.1: 89.14% · SciCode: 56.37%
LiveBench · 2026-06-25 · claude-opus-5-max-effort
Coding: 81.45% · Agentic Coding: 65.20%
ModelRank assigns editorial tiers using public coding evidence, not automatic index thresholds or statistically proven classes. Price, speed, context size and sponsorship do not affect tiers.
DeepSeek V4 Flash 0731 = 100. The index reflects two shared tests, not capability multiples or statistically established gaps.
Results reflect particular model configurations. Agent harnesses, reasoning effort, tools, budgets and tasks may differ. Close indices do not establish superiority. B describes a relative position in this selected group, not an inability to code.
Data checked: 2026-09-10. Snapshot date is the retrieval date, not necessarily the evaluation date.
Grok 4.3
Results reflect particular model configurations. Agent harnesses, reasoning effort, tools, budgets and tasks may differ. Close indices do not establish superiority. B describes a relative position in this selected group, not an inability to code.
API cost estimate
1M input + 200K output (USD):
Claude Opus 5: $10.0000
Grok 4.3: $1.7500
Estimates use the displayed channel and time band; DeepSeek uses peak rates. Cache discounts, tool fees, long-context price tiers and uncounted additional tokens are excluded.
Frequently Asked Questions
Which model is better for coding: Claude Opus 5 or Grok 4.3?
A comparable reference index is unavailable for one or both models; no index-based winner is assigned. Editorial tiers: Claude Opus 5 = S; Grok 4.3 = No tier assessment yet. Tiers are separate editorial assessments and do not establish a reliable order within a tier.
How do Claude Opus 5 and Grok 4.3 compare in API pricing and costs?
Claude Opus 5: $5/1M input, $25/1M output (OpenRouter quote); Grok 4.3: $1.25/1M input, $2.5/1M output (OpenRouter quote). 1M input + 200K output (USD): $10.0000 vs $1.7500.
What are the context window sizes of Claude Opus 5 and Grok 4.3?
Claude Opus 5 provides a 1,000,000 token context window, while Grok 4.3 provides 1,000,000 tokens.