High-volume, cost-sensitive work
Choose Gemini Omni Flash
Gemini Omni Flash costs 16% less on a typical mix of three input tokens for every output token ($3.38 against $4.00 per million tokens).
Claude Sonnet 5.5 vs Gemini Omni Flash: price, context and capabilities
Choose Claude Sonnet 5.5 for the latest release. Choose Gemini Omni Flash for high-volume, cost-sensitive work and writing and code generation.
In short
- Gemini Omni Flash is 16% cheaper than Claude Sonnet 5.5 at the headline price ($3.38 / 1M tokens vs $4.00 / 1M tokens).
- Gemini Omni Flash reads more per request: 1.05M tokens against 1M.
- Claude Sonnet 5.5 is the newer model (September 2026, against August 2026).
- Only Claude Sonnet 5.5 offers prompt caching.
- Only Gemini Omni Flash offers audio input, video input.
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Writing and code generation
Choose Gemini Omni Flash
Gemini Omni Flash charges $9.00 per million output tokens, against $10.00 for Claude Sonnet 5.5. Output dominates the bill when answers are long.
Latest release
Choose Claude Sonnet 5.5
Claude Sonnet 5.5 is the newer release (September 2026, against August 2026 for Gemini Omni Flash).
Monthly cost at three volumes
| Volume | Claude Sonnet 5.5 | Gemini Omni Flash | Difference |
|---|---|---|---|
| Prototype: 1M input, 250K output tokens | $4.50 | $3.75 | Gemini Omni Flash, $0.75 less |
| Production: 20M input, 5M output tokens | $90.00 | $75.00 | Gemini Omni Flash, $15.00 less |
| Scale: 500M input, 100M output tokens | $2,000 | $1,650 | Gemini Omni Flash, $350.00 less |
Standard rates, without caching or batch discounts. Volumes are per month.
Specifications side by side
| Claude Sonnet 5.5 | Gemini Omni Flash | |
|---|---|---|
| Provider | Anthropic | |
| Category | Language models | Language models |
| Status | Generally available | Generally available |
| Headline price | $4.00 / 1M tokens | $3.38 / 1M tokens |
| Input | $2.00 / 1M tokens | $1.50 / 1M tokens |
| Output | $10.00 / 1M tokens | $9.00 / 1M tokens |
| Cached input | $0.10 / 1M tokens | No data |
| Context window | 1M | 1.05M |
| Max output | 128k | No data |
| Released | September 2026 | August 2026 |
| Knowledge cutoff | June 2026 | No data |
| Licence | Proprietary | Proprietary |
| Capabilities | Vision, Reasoning, Tool calling, Structured output, Prompt caching, Batch API | Vision, Audio input, Video input, Reasoning, Tool calling, Structured output, Batch API |
| API model id | claude-sonnet-5-5 | gemini-omni-1.1-flash |
Benchmarks side by side
Leader in bold.
| Benchmark | Claude Sonnet 5.5 | Gemini Omni Flash |
|---|---|---|
| Intelligence Index | 56 | No data |
| SciCode | 61% | No data |
| Humanity's Last Exam | 55% | No data |
| Long-context reasoning (AA-LCR) | 82.7% | No data |
Independent evaluations by Artificial Analysis, run the same way for every model, at the reasoning setting shown. Percentages unless marked as an index.
Frequently asked questions
Should I choose Claude Sonnet 5.5 or Gemini Omni Flash?
Choose Claude Sonnet 5.5 for the latest release. Choose Gemini Omni Flash for high-volume, cost-sensitive work and writing and code generation.
Which is cheaper, Claude Sonnet 5.5 or Gemini Omni Flash?
Gemini Omni Flash is 16% cheaper than Claude Sonnet 5.5 at the headline price ($3.38 / 1M tokens vs $4.00 / 1M tokens).
Which has the larger context window, Claude Sonnet 5.5 or Gemini Omni Flash?
Gemini Omni Flash reads more per request: 1.05M tokens against 1M.
What is the difference between Claude Sonnet 5.5 and Gemini Omni Flash?
Claude Sonnet 5.5 is made by Anthropic and Gemini Omni Flash by Google. Gemini Omni Flash is 16% cheaper than Claude Sonnet 5.5 at the headline price ($3.38 / 1M tokens vs $4.00 / 1M tokens). Gemini Omni Flash reads more per request: 1.05M tokens against 1M. Claude Sonnet 5.5 is the newer model (September 2026, against August 2026). Only Claude Sonnet 5.5 offers prompt caching. Only Gemini Omni Flash offers audio input, video input.
How much do Claude Sonnet 5.5 and Gemini Omni Flash cost per month?
At 20 million input and 5 million output tokens a month, Claude Sonnet 5.5 costs $90.00 and Gemini Omni Flash costs $75.00, at standard rates.
Which is newer, Claude Sonnet 5.5 or Gemini Omni Flash?
Claude Sonnet 5.5 was released on September 2026 and Gemini Omni Flash on August 2026.