Claude Sonnet 4.5 vs Gemini 3.1 Pro
Model Markets Rankings
Intelligence, Cost, and Efficiency
| Ranking | Claude Sonnet 4.5 | Gemini 3.1 Pro |
|---|---|---|
| CostLower is better · Published-token output estimate | UnrankedNot in the 36-model eligible cohort | #22 of 36$0.161 per LiveBench case |
Ranks come from the current complete eligible cohorts. Green highlights appear only when both models are ranked in the same metric. Missing required inputs remain unranked, and the three dimensions are not collapsed into an overall winner.
Benchmark Performance
Available Benchmarks
| Benchmark | Claude Sonnet 4.5 | Gemini 3.1 Pro |
|---|---|---|
| LMArena Document Arenadocument-2026-07-30-011508720696 · arena_rating · statistical tie | 1,446.19100% of row best · rating · claude-sonnet-4-5-20250929; 95% CI [1439.60004073, 1452.78970477]; votes 28634; rank 22 | 1,445.32100% of row best · rating · gemini-3.1-pro-preview; 95% CI [1439.35538449, 1451.29339146]; votes 45162; rank 23 |
| LMArena Search Arenasearch-2026-08-24-011508720696 · arena_rating · leader | 1,158.4696% of row best · rating · claude-sonnet-4-5-search; 95% CI [1153.41447529, 1163.49714967]; votes 127378; rank 24 | 1,210.46100% of row best · rating · gemini-3.1-pro-grounding; 95% CI [1205.32063396, 1215.60669852]; votes 113282; rank 9 |
| LMArena Text Arenatext-2026-09-01-011508720696 · arena_rating · leader | 1,433.9597% of row best · rating · claude-sonnet-4-5-20250929-high-32k; 95% CI [1431.13754052, 1436.75329939]; votes 81031; rank 79 | 1,480.10100% of row best · rating · gemini-3.1-pro-preview; 95% CI [1476.89767236, 1483.30025658]; votes 102763; rank 11 |
| ToneBench2026-08-28-10-task-cd9819ab6e4d · overall_score · leader | 77.2597% of row best · points · Claude Sonnet 4.5 · 2,441 output tokens / case | 79.89100% of row best · points · Gemini 3.1 Pro (high thinking) · 10,009 output tokens / case |
| Overall ResultCounted from the protocol-matched rows above · 1 tie | 0 benchmark wins | 3 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 Sonnet 4.5 | Gemini 3.1 Pro |
|---|---|---|
| Developer | Anthropic | Google DeepMind |
| Family | Claude 4 | Gemini 3 |
| Model | Claude Sonnet 4.5 | Gemini 3.1 Pro |
| Version | Claude Sonnet 4.5 | Gemini 3.1 Pro |
| Lifecycle | active | preview |
| Released | 2025-09-29 | Unknown |
| Knowledge cutoff | 2025-01-01 | Unknown |
| Input modalities | Text, Image | Text, Image, Video, Audio, Document |
| Output modalities | Text | Text |
| Context window | 200K | 1,049K |
| 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) | Google AI (Standard), Google Gemini (Standard) |
| Capabilities | chat, generation, reasoning, structured_outputs, tools | chat, generation, reasoning, tools |
13 comparable fields · 9 material differences · Pair passes the primary-source comparison gate
Claude Sonnet 4.5 Capabilities
Gemini 3.1 Pro Capabilities
Internal Comparison Graph
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Primary Evidence
Sources and Freshness
Questions
Claude Sonnet 4.5 vs Gemini 3.1 Pro FAQs
Is Claude Sonnet 4.5 or Gemini 3.1 Pro better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Sonnet 4.5 and Gemini 3.1 Pro, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Claude Sonnet 4.5 or Gemini 3.1 Pro?+
Claude Sonnet 4.5 is $3.00 and Gemini 3.1 Pro is $2.00 per million tokens, so Gemini 3.1 Pro is cheaper on this metric. Claude Sonnet 4.5 is $15.00 and Gemini 3.1 Pro is $12.00 per million tokens, so Gemini 3.1 Pro is cheaper on this metric.
Which has a larger context window, Claude Sonnet 4.5 or Gemini 3.1 Pro?+
Gemini 3.1 Pro has the larger sourced context window. Claude Sonnet 4.5 supports 200K and Gemini 3.1 Pro supports 1,049K.
Which performs better in benchmarks, Claude Sonnet 4.5 or Gemini 3.1 Pro?+
Gemini 3.1 Pro leads the current overall benchmark count. The result uses 4 protocol-matched benchmarks from 2 publishers; it is not a universal quality score.
Can Claude Sonnet 4.5 or Gemini 3.1 Pro be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Claude Sonnet 4.5 is not marked open weight; Gemini 3.1 Pro is not marked open weight.
Can Claude Sonnet 4.5 and Gemini 3.1 Pro understand images?+
Claude Sonnet 4.5 is documented with image input; Gemini 3.1 Pro is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Claude Sonnet 4.5 or Gemini 3.1 Pro?+
Gemini 3.1 Pro has the larger sourced maximum output: Claude Sonnet 4.5 supports 64K and Gemini 3.1 Pro supports 66K output tokens.
Do Claude Sonnet 4.5 and Gemini 3.1 Pro support reasoning and tool use?+
Claude Sonnet 4.5: reasoning, tool calling, and image input. Gemini 3.1 Pro: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, Claude Sonnet 4.5 or Gemini 3.1 Pro?+
Claude Sonnet 4.5 has 1 sourced provider route; Gemini 3.1 Pro has 2, so Gemini 3.1 Pro has broader tracked availability.
Which offers better value, Claude Sonnet 4.5 or Gemini 3.1 Pro?+
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.