Gemini 3.7 Flash (Google DeepMind, August 13, 2026) and Claude Sonnet 5 (Anthropic, June 30, 2026) are the two mid-tier workhorses most teams will actually run at volume this year. One was built for raw speed; the other for agentic depth, computer use, and safety. This is the direct sequel to our Gemini 3.6 Flash vs Claude Sonnet 5 comparison from July — and a lot has changed in six weeks.
This guide compares the two across benchmarks, pricing, speed, context, and modalities. Figures are drawn from Google's launch chart, Anthropic's documentation, Artificial Analysis, and independent coverage. It's part of our Gemini 3.7 Flash series — see also Grok 4.6 vs Gemini 3.7 Flash.
At a Glance
| Category | Gemini 3.7 Flash | Claude Sonnet 5 |
|---|---|---|
| Release date | August 13, 2026 | June 30, 2026 |
| Developer | Google DeepMind | Anthropic |
| Context window | 1,048,576 tokens | 1,000,000 tokens |
| Max output | 65,536 tokens | 128,000 tokens |
| Input modalities | Text, image, video, audio, PDF | Text, image (+ computer use) |
| Input price | $0.75 / 1M (intro) | $2 / 1M (permanent) |
| Output price | $3.75 / 1M (intro) | $10 / 1M (permanent) |
| Price after intro | $1.50 / $7.50 (Jan 1, 2027) | No change — $2/$10 locked in |
| Reasoning | Low / medium / high | Adaptive thinking, 5 effort levels (xhigh) |
| Model ID | gemini-3.7-flash | claude-sonnet-5 |
Benchmark Comparison
Google's own launch chart is unusually candid: Sonnet 5 wins some rows. Here's where each model leads.
| Evaluation | Gemini 3.7 Flash | Claude Sonnet 5 | Leader |
|---|---|---|---|
| AA Intelligence Index | 56 | 55 (max) | Gemini 3.7 |
| GDPVal-AA v2 (Elo) | 1525 | 1598 | Sonnet 5 |
| AutomationBench | 30.4% | 10.7% | Gemini 3.7 |
| GDP.pdf | 34.0% | 28.0% | Gemini 3.7 |
| FrontierCode 1.1 Main | 43.6% | 42.7% | ≈ Tie |
| Agent's Last Exam (desktop/OS) | 26.3% | 33.3% | Sonnet 5 |
| OSWorld-Verified | — | 81.2% | Sonnet 5 |
| BrowseComp | — | 84.7% | Sonnet 5 |
| Terminal-Bench | 85.8% (2.1) | 80.4% (2.0) | Version mismatch |
Sources: Google DeepMind launch chart (Aug 2026), Anthropic system card, Artificial Analysis model pages. Terminal-Bench rows use different versions (2.1 vs 2.0) and are not directly comparable — see our Terminal-Bench 2.1 leaderboard for apples-to-apples data.
Agentic Benchmarks Head-to-Head
The AutomationBench gap is the story of this matchup: Gemini completes real enterprise workflows nearly 3× as often as Sonnet 5 (30.4% vs 10.7%) per Google's chart. Gemini also edges GDP.pdf document comprehension (34.0 vs 28.0) and effectively ties FrontierCode (43.6 vs 42.7). Sonnet 5's counter: Agent's Last Exam, the multimodal desktop-and-OS evaluation, where it leads by 7 points — and its OSWorld-Verified 81.2% remains among the best computer-use scores published.
Knowledge-Work Elo
Sonnet 5's GDPVal-AA Elo of 1598 leads Gemini's 1525 by 73 points — consistent with the pattern in our Claude Opus 5 analysis, where Anthropic models dominate knowledge-work Elo. If your workload is professional documents, structured analysis, and judgment-heavy deliverables, Sonnet 5 remains the stronger of these two — but note it pays for that depth: at max effort Sonnet 5 uses ~40% more output tokens per task than its predecessor.
Capability Radar
Radar values are normalized (0–100) to the higher of the two models on each axis: Intelligence = AA Index, Knowledge Work = GDPVal-AA v2, Automation = AutomationBench, Documents = GDP.pdf, OS/Computer = Agent's Last Exam, Speed = output t/s.
Pricing: Gemini's Discount vs Sonnet's New Permanent Rate
Update (August 14, 2026): Anthropic has cancelled Sonnet 5's planned September 1 price increase — its $2/$10 launch rate is now permanent. That changes the calculus: Gemini's $0.75/$3.75 is still a limited-time discount (through December 31, 2026, then $1.50/$7.50), while Sonnet's $2/$10 has no expiry date at all. Cost per completed task still favors Gemini:
| Cost component | Gemini 3.7 Flash | Claude Sonnet 5 |
|---|---|---|
| Input (per 1M) | $0.75 (intro) | $2 (permanent) |
| Output (per 1M) | $3.75 (intro) | $10 (permanent) |
| Cost per AA Index task | $0.40 | $2.29 (max) |
Consider a hypothetical agent task using 1M input + 250K output tokens:
That task costs roughly $1.69 on Gemini vs. $4.50 on Sonnet 5 — 2.7× cheaper. The per-task gap is larger still: $0.40 vs $2.29 (5.7×), because Sonnet 5's max effort burns far more tokens per task. One nuance worth knowing: Sonnet 5 uses an updated tokenizer that produces ~1.0–1.35× more tokens than Sonnet 4.6 for the same input — so its real per-character cost is higher than the sticker suggests.
Speed & Latency
No contest on decode speed — Gemini is the fastest reasoning model on the market:
| Metric | Gemini 3.7 Flash | Claude Sonnet 5 |
|---|---|---|
| Output speed | ~340 t/s (high) | 69.4 t/s (max) / 80 t/s (xhigh) |
| Time to first token | ~2.7 s (AIHubMix, traffic) | 202 s (max) / ~2 s (low effort) |
| Time per AA Index task | 1.7 min | — |
Gemini streams ~5× faster than Sonnet 5 at max effort (340 vs 69 t/s). Sonnet 5's max-effort TTFT of ~202 seconds is one of the longest of any frontier model — a direct consequence of adaptive thinking that runs very long before answering. At low effort Sonnet 5 is near-instant, but then you lose the intelligence. If your product has interactive UX, this latency profile is Sonnet's biggest practical weakness; for batch agent jobs that run for hours, it matters far less.
Context & Modalities
Both ship ~1M-token context windows with no long-context surcharge. The differences are at the edges:
- Max output: Sonnet 5 doubles Gemini (128K vs 65,536 tokens) — better for long code generations and full-document rewrites.
- Multimodality: Gemini accepts video and audio; Sonnet 5 is text + image but adds computer use — controlling the desktop, browsers, and GUIs, where its OSWorld-Verified and Agent's Last Exam scores lead this matchup.
- Ecosystem: Sonnet 5 is integrated into Claude Code and is the default for Claude Free/Pro. Gemini 3.7 Flash lives in the Gemini API, AI Studio, Antigravity, and Gemini Enterprise.
- Safety: Anthropic ships Sonnet 5 with real-time cyber safeguards enabled by default and reports lower hallucination/sycophancy rates than Sonnet 4.6.
Verdict: Which Should You Choose?
The honest takeaway from Google's own chart: Gemini 3.7 Flash doesn't sweep — it wins the volume lanes (automation, documents, speed, price) while Sonnet 5 holds the desktop-agent and knowledge-work lanes. Many teams will run both: Gemini as the default high-throughput model, Sonnet 5 for computer-use and Claude Code workloads. If you're coming from our Grok 4.6 vs Gemini 3.7 Flash analysis: Grok beats both on raw intelligence (61), but neither Sonnet nor Gemini can touch Gemini's speed-per-dollar.
Sources
- Google — Gemini 3.7 Flash announcement & comparison chart
- Artificial Analysis — Gemini 3.7 Flash (high)
- Artificial Analysis — Claude Sonnet 5 (max)
- Anthropic — Claude Sonnet 5 launch & system card
- Techmeme — Anthropic makes Sonnet 5's $2/$10 pricing permanent (Aug 2026)
- VentureBeat — Google's Gemini 3.7 Flash targets coding and agents
- Vellum — Claude Sonnet 5 benchmarks explained
- AIHubMix — Gemini 3.7 Flash vs Claude Sonnet 5