Grok 4.3 vs Grok 4.5
Why this pair: Consecutive xAI frontier models
Benchmark Performance
Available Benchmarks
| Benchmark | Grok 4.3 | Grok 4.5 |
|---|---|---|
| LMArena Agent Arenaagent-2026-08-31-011508720696 · outcome_score · leader | -18.8177% of row best · score · Grok 4.3; 95% CI [-20.43612107, -17.19188295]; sessions 82745; observations 1299547; rank 55 | 6.06100% of row best · score · Grok 4.5; 95% CI [4.91016619, 7.21148996]; sessions 34008; observations 1655564; rank 13 |
| LMArena Search Arenasearch-2026-08-24-011508720696 · arena_rating · leader | 1,164.8096% of row best · rating · grok-4.3; 95% CI [1159.64698972, 1169.95391272]; votes 91483; rank 23 | 1,212.65100% of row best · rating · grok-4.5; 95% CI [1205.78347274, 1219.50889748]; votes 31505; rank 8 |
| LMArena Text Arenatext-2026-09-01-011508720696 · arena_rating · leader | 1,397.9796% of row best · rating · grok-4.3; 95% CI [1394.22069381, 1401.72787538]; votes 65024; rank 141 | 1,451.82100% of row best · rating · grok-4.5; 95% CI [1446.90989155, 1456.73122428]; votes 25873; rank 39 |
| LMArena Vision Arenavision-2026-08-27-011508720696 · arena_rating · leader | 1,227.7795% of row best · rating · grok-4.3; 95% CI [1221.16111143, 1234.37137614]; votes 20787; rank 65 | 1,291.11100% of row best · rating · grok-4.5; 95% CI [1282.25469345, 1299.96666150]; votes 6401; rank 22 |
| LiveBench2026-06-25 · overall · leader | 69.2787% of row best · percent · grok-4.3 · 11,184 output tokens / case | 80.01100% of row best · percent · grok-4.5 · 10,517 output tokens / case |
| ToneBench2026-08-28-10-task-cd9819ab6e4d · overall_score · leader | 74.9191% of row best · points · Grok 4.3 (high) · 5,154 output tokens / case | 82.23100% of row best · points · Grok 4.5 · 2,688 output tokens / case |
| Overall ResultCounted from the protocol-matched rows above | 0 benchmark wins | 6 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 | Grok 4.3 | Grok 4.5 |
|---|---|---|
| Developer | xAI | xAI |
| Family | Grok 4 | Grok 4 |
| Model | Grok 4.3 | Grok 4.5 |
| Version | Grok 4.3 | Grok 4.5 |
| Lifecycle | active | active |
| Released | 2026-06-17 | 2026-07-16 |
| Knowledge cutoff | Unknown | Unknown |
| 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 | Xai (Standard) | Xai (Standard) |
| Capabilities | chat, generation, reasoning, structured_outputs, tools | chat, generation, reasoning, structured_outputs, tools |
14 comparable fields · 4 material differences · Editorially curated pair passes the primary-source comparison gate
Grok 4.3 Capabilities
Grok 4.5 Capabilities
Internal Comparison Graph
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Primary Evidence
Sources and Freshness
Questions
Grok 4.3 vs Grok 4.5 FAQs
Is Grok 4.3 or Grok 4.5 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Grok 4.3 and Grok 4.5, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Grok 4.3 or Grok 4.5?+
Grok 4.3 is $1.25 and Grok 4.5 is $2.00 per million tokens, so Grok 4.3 is cheaper on this metric. Grok 4.3 is $2.50 and Grok 4.5 is $6.00 per million tokens, so Grok 4.3 is cheaper on this metric.
Which has a larger context window, Grok 4.3 or Grok 4.5?+
Grok 4.3 has the larger sourced context window. Grok 4.3 supports 1,000,000 and Grok 4.5 supports 500,000.
Which performs better in benchmarks, Grok 4.3 or Grok 4.5?+
Grok 4.5 leads the current overall benchmark count. The result uses 6 protocol-matched benchmarks from 3 publishers; it is not a universal quality score.
Can Grok 4.3 or Grok 4.5 be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Grok 4.3 is not marked open weight; Grok 4.5 is not marked open weight.
Can Grok 4.3 and Grok 4.5 understand images?+
Grok 4.3 is documented with image input; Grok 4.5 is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Grok 4.3 or Grok 4.5?+
Neither has a larger sourced maximum output. Grok 4.3 is — and Grok 4.5 is —.
Do Grok 4.3 and Grok 4.5 support reasoning and tool use?+
Grok 4.3: reasoning, tool calling, and image input. Grok 4.5: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, Grok 4.3 or Grok 4.5?+
Grok 4.3 has 1 sourced provider route; Grok 4.5 has 1, a tie.
Which offers better value, Grok 4.3 or Grok 4.5?+
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.