Claude Sonnet 5 vs Gemini 3 Pro
Claude Sonnet 5 (2026) and Gemini 3 Pro (2025) are frontier reasoning models from Anthropic and Google DeepMind. Both ship a 1M-token context window. On SWE-bench Verified, Claude Sonnet 5 leads by 9 pts. On pricing, Gemini 3 Pro costs $1.25/1M input tokens versus $2/1M for the alternative. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
Gemini 3 Pro is ~60% cheaper at $1.25/1M; pay for Claude Sonnet 5 only for coding workflow support.
Decision scorecard
Local evidence first| Signal | Claude Sonnet 5 | Gemini 3 Pro |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | multimodal apps, tool-calling agents, and long-context analysis |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 1M | 1M |
| Cheapest output | $10/1M tokens | $5/1M tokens |
| Provider routes | 6 tracked | 2 tracked |
| Shared benchmarks | SWE-bench Verified leader | 5 shared |
Decision tradeoffs
- Claude Sonnet 5 holds a shared-benchmark lead on SWE-bench Verified, ahead by 9 points.
- Claude Sonnet 5 has broader tracked provider coverage for fallback and route flexibility.
- Claude Sonnet 5 uniquely exposes Reasoning and Structured outputs in local model data.
- Local decision data tags Claude Sonnet 5 for Coding, RAG, and Agents.
- Gemini 3 Pro holds a shared-benchmark lead on LMArena Text Arena - Creative Writing, ahead by 66 points.
- Gemini 3 Pro has the lower cheapest tracked output price at $5/1M tokens.
- Local decision data tags Gemini 3 Pro for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Claude Sonnet 5
$4,100
Cheapest tracked route/tier: Anthropic
Gemini 3 Pro
$2,250
Cheapest tracked route/tier: GCP Vertex AI
Estimated monthly gap: $1,850. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on GCP Vertex AI; start route-level A/B tests there.
- Gemini 3 Pro is $5/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Reasoning and Structured outputs before moving production traffic.
- Provider overlap exists on GCP Vertex AI; start route-level A/B tests there.
- Claude Sonnet 5 is $5/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Claude Sonnet 5 adds Reasoning and Structured outputs in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-06-30 | 2025-12-11 |
| Context window | 1M | 1M |
| Parameters | — | — |
| Architecture | Decoder Only | Decoder Only |
| License | Proprietary | Proprietary |
| Openness | Proprietary | Proprietary |
| Weights | Not released | Not released |
| Code | Unknown | Unknown |
| Commercial use | Restricted | Restricted |
| Knowledge cutoff | 2026-01 | 2025-01 |
Pricing and availability
| Pricing attribute | Claude Sonnet 5 | Gemini 3 Pro |
|---|---|---|
| Input price | $2/1M tokens | $1.25/1M tokens |
| Output price | $10/1M tokens | $5/1M tokens |
| Providers |
Capabilities
| Capability | Claude Sonnet 5 | Gemini 3 Pro |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | No |
| JSON / Tool use | Yes | Yes |
| Structured outputs | Yes | No |
| Code execution | Yes | Yes |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
| Benchmark | Claude Sonnet 5 | Gemini 3 Pro |
|---|---|---|
| SWE-bench Verified | 85.2 | 76.2 |
| SWE-bench Pro | 63.2 | 42.5 |
| LMArena Text Arena - Creative Writing | 1416.0 | 1482.0 |
| LMArena Vision Arena | 1262.0 | 1289.0 |
| Chatbot Arena | 1462.0 | 1486.0 |
Deep dive
On shared benchmark coverage, SWE-bench Verified has Claude Sonnet 5 at 85.2 and Gemini 3 Pro at 76.2, with Claude Sonnet 5 ahead by 9 points; SWE-bench Pro has Claude Sonnet 5 at 63.2 and Gemini 3 Pro at 42.5, with Claude Sonnet 5 ahead by 20.7 points; LMArena Text Arena - Creative Writing has Claude Sonnet 5 at 1416 and Gemini 3 Pro at 1482, with Gemini 3 Pro ahead by 66 points. The largest visible gap is 66 points on LMArena Text Arena - Creative Writing, which matters most when that benchmark mirrors your workload. Treat isolated benchmark wins as directional, because provider routing, prompt style, and tool access can move real application results.
The capability footprint differs most on reasoning mode: Claude Sonnet 5 and structured outputs: Claude Sonnet 5. Both models share vision, multimodal input, JSON / Tool use, and JSON / Tool use, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
For cost, Claude Sonnet 5 lists $2/1M input and $10/1M output tokens on the cheapest listed provider, while Gemini 3 Pro lists $1.25/1M input and $5/1M output tokens on the cheapest listed provider. A 70/30 input-output blend puts Gemini 3 Pro lower by about $2.03 per million blended tokens. Availability is 6 providers versus 2, so concentration risk also matters.
Choose Claude Sonnet 5 when coding workflow support and broader provider choice are central to the workload. Choose Gemini 3 Pro when coding workflow support and lower input-token cost are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship.
FAQ
Which has a larger context window, Claude Sonnet 5 or Gemini 3 Pro?
Claude Sonnet 5 supports 1M tokens, while Gemini 3 Pro supports 1M tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Which is cheaper, Claude Sonnet 5 or Gemini 3 Pro?
Gemini 3 Pro is cheaper on listed token pricing. Claude Sonnet 5 costs $2/1M input and $10/1M output tokens. Gemini 3 Pro costs $1.25/1M input and $5/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Claude Sonnet 5 or Gemini 3 Pro open source?
Claude Sonnet 5 is listed under Proprietary. Gemini 3 Pro is listed under Proprietary. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for vision, Claude Sonnet 5 or Gemini 3 Pro?
Both Claude Sonnet 5 and Gemini 3 Pro expose vision. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Which is better for multimodal input, Claude Sonnet 5 or Gemini 3 Pro?
Both Claude Sonnet 5 and Gemini 3 Pro expose multimodal input. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Where can I run Claude Sonnet 5 and Gemini 3 Pro?
Claude Sonnet 5 is available on Anthropic, AWS Bedrock, GCP Vertex AI, OpenRouter, and Microsoft Foundry. Gemini 3 Pro is available on Replicate API and GCP Vertex AI. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-10-17. Data sourced from public model cards and provider documentation.