Claude Opus 4.6 vs Grok 4.3
Benchmark Performance
Available Benchmarks
| Benchmark | Claude Opus 4.6 | Grok 4.3 |
|---|---|---|
| LMArena Agent Arenaagent-2026-08-31-011508720696 · outcome_score · leader | 5.22100% of row best · score · Claude Opus 4.6; 95% CI [3.87284067, 6.56107425]; sessions 36365; observations 1299912; rank 17 | -18.8177% of row best · score · Grok 4.3; 95% CI [-20.43612107, -17.19188295]; sessions 82745; observations 1299547; rank 55 |
| LMArena Search Arenasearch-2026-08-24-011508720696 · arena_rating · leader | 1,253.42100% of row best · rating · claude-opus-4-6-search; 95% CI [1248.44594166, 1258.38585709]; votes 134699; rank 2 | 1,164.8093% of row best · rating · grok-4.3; 95% CI [1159.64698972, 1169.95391272]; votes 91483; rank 23 |
| LMArena Text Arenatext-2026-09-01-011508720696 · arena_rating · leader | 1,497.70100% of row best · rating · claude-opus-4-6; 95% CI [1494.29292018, 1501.10380984]; votes 76032; rank 4 | 1,397.9793% of row best · rating · grok-4.3; 95% CI [1394.22069381, 1401.72787538]; votes 65024; rank 141 |
| LMArena Vision Arenavision-2026-08-27-011508720696 · arena_rating · leader | 1,311.43100% of row best · rating · claude-opus-4-6; 95% CI [1304.90444379, 1317.95290154]; votes 25210; rank 7 | 1,227.7794% of row best · rating · grok-4.3; 95% CI [1221.16111143, 1234.37137614]; votes 20787; rank 65 |
| LiveBench2026-06-25 · overall · leader | 78.69100% of row best · percent · claude-opus-4-6-thinking-auto-high-effort · 9,651 output tokens / case | 69.2788% of row best · percent · grok-4.3 · 11,184 output tokens / case |
| ToneBench2026-08-28-10-task-cd9819ab6e4d · overall_score · leader | 84.21100% of row best · points · Claude Opus 4.6 · 2,607 output tokens / case | 74.9189% of row best · points · Grok 4.3 (high) · 5,154 output tokens / case |
| Overall ResultCounted from the protocol-matched rows above | 6 benchmark winsOverall lead | 0 benchmark wins |
Third-party benchmark Only like-for-like primary-publisher results are shown; raw scores, relative scores, configuration, and token spend remain visible.
Technical Differences
Side-by-Side Facts
| Field | Claude Opus 4.6 | Grok 4.3 |
|---|---|---|
| Developer | Anthropic | xAI |
| Family | Claude 4 | Grok 4 |
| Model | Claude Opus 4.6 | Grok 4.3 |
| Version | Claude Opus 4.6 | Grok 4.3 |
| Lifecycle | active | active |
| Released | 2026-02-05 | 2026-06-17 |
| Knowledge cutoff | 2025-05-01 | Unknown |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 1,000,000 | 1,000,000 |
| Total parameters | Unknown | Unknown |
| Active parameters | Unknown | Unknown |
| License | Unknown | Unknown |
| Open weights | No | No |
| API available | Yes | Yes |
| Self-hostable | No | No |
| Provider access | Anthropic (Standard) | Xai (Standard) |
| Capabilities | chat, generation, reasoning, structured_outputs, tools | chat, generation, reasoning, structured_outputs, tools |
14 comparable fields · 6 material differences · Pair passes the primary-source comparison gate
Claude Opus 4.6 Capabilities
Grok 4.3 Capabilities
Primary Evidence
Sources and Freshness
Questions
Claude Opus 4.6 vs Grok 4.3 FAQs
Is Claude Opus 4.6 or Grok 4.3 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Opus 4.6 and Grok 4.3, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Claude Opus 4.6 or Grok 4.3?+
Claude Opus 4.6 is $5.00 and Grok 4.3 is $1.25 per million tokens, so Grok 4.3 is cheaper on this metric. Claude Opus 4.6 is $25.00 and Grok 4.3 is $2.50 per million tokens, so Grok 4.3 is cheaper on this metric.
Which has a larger context window, Claude Opus 4.6 or Grok 4.3?+
Neither model has a larger sourced context window in this comparison. Claude Opus 4.6 is 1,000,000 and Grok 4.3 is 1,000,000.
Which performs better in benchmarks, Claude Opus 4.6 or Grok 4.3?+
Claude Opus 4.6 leads the current overall benchmark count. The result uses 6 protocol-matched benchmarks from 3 publishers; it is not a universal quality score.
Can Claude Opus 4.6 or Grok 4.3 be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Claude Opus 4.6 is not marked open weight; Grok 4.3 is not marked open weight.
Can Claude Opus 4.6 and Grok 4.3 understand images?+
Claude Opus 4.6 is documented with image input; Grok 4.3 is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Claude Opus 4.6 or Grok 4.3?+
Neither has a larger sourced maximum output. Claude Opus 4.6 is 128,000 and Grok 4.3 is —.
Do Claude Opus 4.6 and Grok 4.3 support reasoning and tool use?+
Claude Opus 4.6: reasoning, tool calling, and image input. Grok 4.3: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, Claude Opus 4.6 or Grok 4.3?+
Claude Opus 4.6 has 1 sourced provider route; Grok 4.3 has 1, a tie.
Which offers better value, Claude Opus 4.6 or Grok 4.3?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.