Models, measured side by side
Claude Opus 5.5 vs Phi-4
Compare Claude Opus 5.5, Phi-4 by token pricing, context length, benchmark results, speed and tool support.
Monthly workload
Monthly cost breakdown
InputOutput
Claude Opus 5.5
$180 / mo
Phi-4
$2.10 / mo
Performance comparison
Claude Opus 5.5
57.6
Phi-4
5.9
Overview
Pricing & capacity
| Pricing & capacity | Claude Opus 5.5 | Phi-4 |
|---|---|---|
| Input / 1M tokens | $4.00 | $0.07 |
| Output / 1M tokens | $20 | $0.14 |
| Cached input / 1M | $0.20 | Not listed |
| Monthly cost | $180 | $2.10 |
| Context window | 1M | 16K |
| Maximum output | 128K | 15K |
Input / 1M tokens
- Claude Opus 5.5
- $4.00
- Phi-4
- $0.07
Output / 1M tokens
- Claude Opus 5.5
- $20
- Phi-4
- $0.14
Cached input / 1M
- Claude Opus 5.5
- $0.20
- Phi-4
- Not listed
Monthly cost
- Claude Opus 5.5
- $180
- Phi-4
- $2.10
Context window
- Claude Opus 5.5
- 1M
- Phi-4
- 16K
Maximum output
- Claude Opus 5.5
- 128K
- Phi-4
- 15K
Benchmarks & performance
| Benchmarks & performance | Claude Opus 5.5 | Phi-4 |
|---|---|---|
| Arena Elo | Not listed | 1,123 |
| MMLU-Pro | Not listed | 60.7% |
| Intelligence Index | 57.6 | 5.9 |
| GPQA | Not listed | 57.5% |
| Humanity’s Last Exam | 61.4% | 3.8% |
| SciCode | 66.9% | Not listed |
| Output speed | 91 tokens/s | 39 tokens/s |
| Time to first token | 755.54 s | 2.59 s |
| DesignArena rating | 1,407 | Not listed |
| DesignArena win rate | 65.3% | Not listed |
Arena Elo
- Claude Opus 5.5
- Not listed
- Phi-4
- 1,123
MMLU-Pro
- Claude Opus 5.5
- Not listed
- Phi-4
- 60.7%
Intelligence Index
- Claude Opus 5.5
- 57.6
- Phi-4
- 5.9
GPQA
- Claude Opus 5.5
- Not listed
- Phi-4
- 57.5%
Humanity’s Last Exam
- Claude Opus 5.5
- 61.4%
- Phi-4
- 3.8%
SciCode
- Claude Opus 5.5
- 66.9%
- Phi-4
- Not listed
Output speed
- Claude Opus 5.5
- 91 tokens/s
- Phi-4
- 39 tokens/s
Time to first token
- Claude Opus 5.5
- 755.54 s
- Phi-4
- 2.59 s
DesignArena rating
- Claude Opus 5.5
- 1,407
- Phi-4
- Not listed
DesignArena win rate
- Claude Opus 5.5
- 65.3%
- Phi-4
- Not listed
Tools & features
| Tools & features | Claude Opus 5.5 | Phi-4 |
|---|---|---|
| Function calling | Supported | Not listed |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Not listed |
| Deterministic seed | Not listed | Supported |
| Prompt caching | Supported | Not listed |
Function calling
- Claude Opus 5.5
- Supported
- Phi-4
- Not listed
Structured outputs
- Claude Opus 5.5
- Supported
- Phi-4
- Supported
JSON mode
- Claude Opus 5.5
- Supported
- Phi-4
- Supported
Reasoning
- Claude Opus 5.5
- Supported
- Phi-4
- Not listed
Deterministic seed
- Claude Opus 5.5
- Not listed
- Phi-4
- Supported
Prompt caching
- Claude Opus 5.5
- Supported
- Phi-4
- Not listed
API & availability
| API & availability | Claude Opus 5.5 | Phi-4 |
|---|---|---|
| API identifier | claude-opus-5.5 | phi-4 |
| API providers | Not listed | DeepInfra |
| Knowledge cutoff | Not listed | 2024-06-30 |
| Prices checked | Oct 8, 2026 | Oct 8, 2026 |
API identifier
- Claude Opus 5.5
claude-opus-5.5- Phi-4
phi-4
API providers
- Claude Opus 5.5
- Not listed
- Phi-4
- DeepInfra
Knowledge cutoff
- Claude Opus 5.5
- Not listed
- Phi-4
- 2024-06-30
Prices checked
- Claude Opus 5.5
- Oct 8, 2026
- Phi-4
- Oct 8, 2026
About the models
Claude Opus 5.5
Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. It is particularly strong at multi-step changes in large codebases, code...
Full pricing & detailsComparison FAQ
Claude Opus 5.5: $4.00 input and $20 output per million tokens. Phi-4: $0.07 input and $0.14 output per million tokens. The cheaper choice depends on your input-to-output ratio; a model can have a lower input rate but a higher output rate.