Claude Opus 4.8 vs Grok 4.6
Benchmark Performance
Available Benchmarks
| Benchmark | Claude Opus 4.8 | Grok 4.6 |
|---|---|---|
| LMArena Text Arenatext-2026-09-01-011508720696 · arena_rating · statistical tie | 1,451.98100% of row best · rating · claude-opus-4-8; 95% CI [1447.69484580, 1456.25837678]; votes 49123; rank 38 | 1,443.7599% of row best · rating · grok-4.6-high; 95% CI [1433.62910542, 1453.86294509]; votes 3453; rank 55 |
| LiveBench2026-06-25 · overall · leader | 81.1899% of row best · percent · claude-opus-4-8-max-effort · 24,171 output tokens / case | 82.17100% of row best · percent · grok-4.6 · 16,154 output tokens / case |
| ToneBench2026-08-14-10-task · overall_score · leader | 88.09100% of row best · points · Claude Opus 4.8 (max effort) · 13,476 output tokens / case | 88.14100% of row best · points · Grok 4.6 (high) · 15,288 output tokens / case |
| Overall ResultCounted from the protocol-matched rows above · 1 tie | 0 benchmark wins | 2 benchmark winsOverall lead |
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 4.8 | Grok 4.6 |
|---|---|---|
| Developer | Anthropic | xAI |
| Family | Claude 4 8 | Grok 4 |
| Model | Claude Opus 4.8 | Grok 4.6 |
| Version | Claude Opus 4.8 | Grok 4.6 |
| Lifecycle | active | active |
| Released | 2026-05-28 | Unknown |
| Knowledge cutoff | 2026-01-01 | 2026-02-01 |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 1,000,000 | 500,000 |
| 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), Deepinfra (Standard) | xAI (Standard) |
| Capabilities | chat, generation, reasoning, tools | chat, generation, reasoning, tools |
14 comparable fields · 7 material differences · Pair passes the primary-source comparison gate
Claude Opus 4.8 Capabilities
Grok 4.6 Capabilities
Internal Comparison Graph
Related Comparisons
| A | Pair | B | Context |
|---|---|---|---|
Claude Fable 5.1Anthropic | vs | Grok 4.6xAI | cross-developer peersimage, text |
Claude Mythos 5.1Anthropic | vs | Grok 4.6xAI | cross-developer peersimage, text |
Claude Opus 4.8Anthropic | vs | Claude Opus 5Anthropic | family variantsimage, text |
Claude Fable 5Anthropic | vs | Claude Opus 4.8Anthropic | family variantsimage, text |
Claude Mythos 5.1Anthropic | vs | Claude Opus 4.8Anthropic | family variantsimage, text |
Claude Opus 4.8Anthropic | vs | Claude Sonnet 5Anthropic | family variantsimage, text |
| vs | Grok 4.6xAI | family variantsimage, text | |
 MiniMax-M3MiniMax | vs | Claude Opus 4.8Anthropic | cross-developer peersimage, text |
Claude Opus 4.8Anthropic | vs |  GPT-5.6 LunaOpenAI | cross-developer peersimage, text |
Claude Opus 4.8Anthropic | vs | GPT-5.6 SolOpenAI | cross-developer peersimage, text |
 Qwen3.5-35B-A3BQwen | vs | Grok 4.6xAI | cross-developer peersimage, text |
 Ministral-3-14B-Reasoning-2512Mistral AI | vs | Grok 4.6xAI | cross-developer peersimage, text |
Primary Evidence
Sources and Freshness
Questions
Claude Opus 4.8 vs Grok 4.6 FAQs
Is Claude Opus 4.8 or Grok 4.6 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Opus 4.8 and Grok 4.6, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Claude Opus 4.8 or Grok 4.6?+
Claude Opus 4.8 is $5.00 and Grok 4.6 is $2.00 per million tokens, so Grok 4.6 is cheaper on this metric. Claude Opus 4.8 is $25.00 and Grok 4.6 is $6.00 per million tokens, so Grok 4.6 is cheaper on this metric.
Which has a larger context window, Claude Opus 4.8 or Grok 4.6?+
Claude Opus 4.8 has the larger sourced context window. Claude Opus 4.8 supports 1,000,000 and Grok 4.6 supports 500,000.
Which performs better in benchmarks, Claude Opus 4.8 or Grok 4.6?+
Grok 4.6 leads the current overall benchmark count. The result uses 3 protocol-matched benchmarks from 3 publishers; it is not a universal quality score.
Can Claude Opus 4.8 or Grok 4.6 be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Claude Opus 4.8 is not marked open weight; Grok 4.6 is not marked open weight.
Can Claude Opus 4.8 and Grok 4.6 understand images?+
Claude Opus 4.8 is documented with image input; Grok 4.6 is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Claude Opus 4.8 or Grok 4.6?+
Neither has a larger sourced maximum output. Claude Opus 4.8 is 128,000 and Grok 4.6 is —.
Do Claude Opus 4.8 and Grok 4.6 support reasoning and tool use?+
Claude Opus 4.8: reasoning, tool calling, and image input. Grok 4.6: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, Claude Opus 4.8 or Grok 4.6?+
Claude Opus 4.8 has 2 sourced provider routes; Grok 4.6 has 1, so Claude Opus 4.8 has broader tracked availability.
Which offers better value, Claude Opus 4.8 or Grok 4.6?+
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.