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Claude 4 Opus vs Grok 3
Which AI model is better in 2026? Compare Claude 4 Opus and Grok 3 on benchmarks, pricing, speed, context window, and real-world fit.
Quick summary
Grok 3 is currently the stronger overall pick for math, context, speed, and price. Claude 4 Opus wins on reasoning and coding. Grok 3 is also cheaper on blended API price ($6.00 vs $16.00 / 1M).
Overall winner
Grok 3
Claude 4 Opus wins
- Reasoning
- Coding
Grok 3 wins
- Math
- Context
- Speed
- Price
Want to compare different models?
Pick any two modelsClaude 4 Opus vs Grok 3: overview
Claude 4 Opus (Anthropic) and Grok 3 (xAI) are frequently compared by teams choosing an AI stack in 2026. Claude 4 Opus: Anthropic’s 2026 flagship — best-in-class on code and long-horizon agents. Grok 3: Real-time data via X — competitive on reasoning, 1M context. This Claude 4 Opus vs Grok 3 comparison covers benchmarks, pricing, context window, speed, modalities, strengths, weaknesses, and who should pick which model.
Claude 4 Opus is proprietary with a 500k-token context window and a blended API price near $16.00 / 1M tokens (intelligence index 81/100). Grok 3 is proprietary with 1M context at about $6.00 blended / 1M (intelligence 74/100). Those gaps drive most “Claude 4 Opus vs Grok 3” searches — quality versus cost, closed versus open, cloud versus self-host.
Where they differ most: Claude 4 Opus tends to lead on reasoning and coding, while Grok 3 leads on math, context, speed, and price. Choose Grok 3 when you want the stronger overall profile on our scorecard; validate with your own evals before migrating production traffic.
Claude 4 Opus is often shortlisted for long-context coding, tool-using agents, and document understanding. Grok 3 fits real-time research and social-aware apps. Scroll to pricing, real-world tasks, and the who-should-choose section for decision support.
People search “Claude 4 Opus vs Grok 3”, “which is better”, and “Claude 4 Opus vs Grok 3 pricing” for the same reason: switching models is expensive if quality drops, and staying put is expensive if you overpay. Use the winner card for a fast answer, the head-to-head table for receipts, and the editorial verdict for a human recommendation. Claude 4 Opus currently ranks among frontier options from Anthropic; Grok 3 is a hosted alternative from xAI. If API pricing is your main concern, start with the pricing section; for multimodal workloads, check vision/audio rows in technical differences; for agents and long documents, prioritize context and reasoning wins.
Head to head
Pricing comparison
API cost is often the deciding factor in Claude 4 Opus vs Grok 3 for high-volume apps. Figures below use catalog list prices with a 3:1 input:output blend for monthly estimates. Cached input, batch, and realtime surcharges vary by provider — confirm on official docs.
| API cost | Claude 4 Opus | Grok 3 |
|---|---|---|
| Input / 1M tokens | $8.00 | $3.00 |
| Output / 1M tokens | $40.00 | $15.00 |
| Blended (3:1) / 1M | $16.00 | $6.00 |
| Est. cost @ 1M blended tokens | $16.00 | $6.00 |
| Est. cost @ 10M blended tokens | $160.00 | $60.00 |
| Est. cost @ 100M blended tokens | $1600.00 | $600.00 |
Cached input, batch API, and realtime surcharges are provider-specific and not always published in our catalog — verify on official pricing pages.
Benchmark showdown
Claude 4 Opus leads on MMLU, MMLU Pro, GPQA, and HumanEval, indicating stronger coding and reasoning-oriented scores. Grok 3 leads on MATH. Grok 3 remains attractive for production deployments on price. Raw benchmarks shortlist models — run task-specific evals before you switch.
Real-world performance
Beyond academic scores, here is how Claude 4 Opus vs Grok 3 tends to split common product tasks based on catalog strengths, price, and modalities.
| Task | Winner |
|---|---|
| Coding | Claude 4 Opus |
| Blog writing | Claude 4 Opus |
| Research | Grok 3 |
| Customer support | Grok 3 |
| Cheap API / high volume | Grok 3 |
| AI agents | Grok 3 |
| Summarization | Claude 4 Opus |
| Translation | Claude 4 Opus |
| Vision / multimodal | Claude 4 Opus |
| Self-hosting / open weights | Grok 3 |
Technical differences
| Feature | Claude 4 Opus | Grok 3 |
|---|---|---|
| Provider | Anthropic | xAI |
| License | Proprietary | Proprietary |
| Pricing model | tokens | tokens |
| Context window | 500k tokens | 1M tokens |
| Max output | 32k tokens | 16k tokens |
| Vision input | Yes | Yes |
| Audio input | No | No |
| Text output | Yes | Yes |
| Image output | No | No |
| Video output | No | No |
| Audio output | No | No |
| Self-host friendly | No | No |
| Docs | Available | Available |
Strengths, weaknesses and best-for
- Top HumanEval
- Long, coherent outputs
- 500k context
- Slower than Sonnet
- Premium price
- Long-context coding
- Tool-using agents
- Document understanding
- Live X data
- 1M context
- Strong reasoning mode
- Smaller ecosystem
- Less tool-use tooling
- Real-time research
- Social-aware apps
Who should choose which
Choose Claude 4 Opus if
- You need stronger reasoning, coding, or math quality
- Long-context coding
- Tool-using agents
Choose Grok 3 if
- You need stronger reasoning, coding, or math quality
- You need a larger context window
- You care about faster token throughput
- API budget is the top constraint
- Real-time research
Pros & cons
Claude 4 Opus
Pros
- Top HumanEval
- Long, coherent outputs
- 500k context
Cons
- Slower than Sonnet
- Premium price
Grok 3
Pros
- Live X data
- 1M context
- Strong reasoning mode
Cons
- Smaller ecosystem
- Less tool-use tooling
Editorial verdict
Grok 3 edges this matchup — with caveats
Grok 3 is the better choice when you prioritize math, context, speed, and price. Claude 4 Opus stands out for reasoning and coding, making it a strong option when those dimensions matter more than raw leaderboard rank. If maximum measured performance matters, Grok 3 wins this matchup. If your niche constraints matter more, Claude 4 Opus is difficult to beat. Always confirm with a bake-off on your real prompts before cutting over.
Still deciding? Read the full Claude 4 Opus review and Grok 3 review, or open the full AI models table.
Claude 4 Opus vs Grok 3 — frequently asked questions
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