Claude Fable 5 vs Grok 4.3
Benchmark Performance
Available Benchmarks
| Benchmark | Claude Fable 5 | Grok 4.3 |
|---|---|---|
| LMArena Agent Arenaagent-2026-08-31-011508720696 · outcome_score · leader | 10.58100% of row best · score · Claude Fable 5 (High); 95% CI [9.03695952, 12.11501267]; sessions 34905; observations 1709479; rank 3 | -18.8173% 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 | 1,230.22100% of row best · rating · claude-fable-5; 95% CI [1222.30895335, 1238.13609545]; votes 41795; rank 5 | 1,164.8095% 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 | 1,494.40100% of row best · rating · claude-fable-5; 95% CI [1489.42750707, 1499.38052801]; votes 26977; rank 5 | 1,397.9794% 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 | 1,329.46100% of row best · rating · claude-fable-5; 95% CI [1321.03632319, 1337.88661881]; votes 10002; rank 1 | 1,227.7792% of row best · rating · grok-4.3; 95% CI [1221.16111143, 1234.37137614]; votes 20787; rank 65 |
| LiveBench2026-06-25 · overall · leader | 86.55100% of row best · percent · claude-fable-5-max-effort · 20,255 output tokens / case | 69.2780% of row best · percent · grok-4.3 · 11,184 output tokens / case |
| ToneBench2026-08-28-10-task-cd9819ab6e4d · overall_score · leader | 89.06100% of row best · points · Claude Fable 5 (xhigh) · 2,862 output tokens / case | 74.9184% 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 Fable 5 | Grok 4.3 |
|---|---|---|
| Developer | Anthropic | Xai |
| Family | Claude 5 | Grok 4 |
| Model | Claude Fable 5 | Grok 4.3 |
| Version | Claude Fable 5 | Grok 4.3 |
| Lifecycle | active | active |
| Released | 2026-06-09 | 2026-06-17 |
| Knowledge cutoff | Unknown | Unknown |
| Input modalities | Unknown | Unknown |
| Output modalities | Unknown | Unknown |
| 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), Deepinfra (Standard), Openrouter (Standard) | Xai (Standard) |
| Capabilities | chat, generation, reasoning, tools | chat, generation, reasoning, structured_outputs, tools |
12 comparable fields · 7 material differences · Interactive comparison only; indexing gate not met
Claude Fable 5 Capabilities
Grok 4.3 Capabilities
Primary Evidence
Sources and Freshness
Questions
Claude Fable 5 vs Grok 4.3 FAQs
Is Claude Fable 5 or Grok 4.3 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Fable 5 and Grok 4.3, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Claude Fable 5 or Grok 4.3?+
Only Claude Fable 5 has a directly sourced input price: $10.00 per million tokens. Only Claude Fable 5 has a directly sourced output price: $50.00 per million tokens.
Which has a larger context window, Claude Fable 5 or Grok 4.3?+
Neither model has a larger sourced context window in this comparison. Claude Fable 5 is 1,000,000 and Grok 4.3 is 1,000,000.
Which performs better in benchmarks, Claude Fable 5 or Grok 4.3?+
Claude Fable 5 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 Fable 5 or Grok 4.3 be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Claude Fable 5 is not marked open weight; Grok 4.3 is not marked open weight.
Can Claude Fable 5 and Grok 4.3 understand images?+
Claude Fable 5 is not documented with image input; Grok 4.3 is not documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Claude Fable 5 or Grok 4.3?+
Neither has a larger sourced maximum output. Claude Fable 5 is 128,000 and Grok 4.3 is —.
Do Claude Fable 5 and Grok 4.3 support reasoning and tool use?+
Claude Fable 5: reasoning and tool calling. Grok 4.3: reasoning and tool calling. Feature support does not establish relative quality.
Which is available from more inference providers, Claude Fable 5 or Grok 4.3?+
Claude Fable 5 has 3 sourced provider routes; Grok 4.3 has 1, so Claude Fable 5 has broader tracked availability.
Which offers better value, Claude Fable 5 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.