Models, measured side by side
Claude Opus 5.5 vs Mistral Medium 3.5
Compare Claude Opus 5.5, Mistral Medium 3.5 by token pricing, context length, benchmark results, speed and tool support.
Monthly workload
Monthly cost breakdown
InputOutput
Claude Opus 5.5
$180 / mo
Mistral Medium 3.5
$68 / mo
Performance comparison
Claude Opus 5.5
57.6
Mistral Medium 3.5
14.2
Overview
| Overview | Claude Opus 5.5 | Mistral Medium 3.5 |
|---|---|---|
| Provider | Anthropic | Mistral AI |
| Released | 2026-09-22 | 2026-04-30 |
| Status | Active | Active |
| Input formats | textimagefile | textimagefile |
| Output formats | text | text |
Provider
- Claude Opus 5.5
- Anthropic
- Mistral Medium 3.5
- Mistral AI
Released
- Claude Opus 5.5
- 2026-09-22
- Mistral Medium 3.5
- 2026-04-30
Status
- Claude Opus 5.5
- Active
- Mistral Medium 3.5
- Active
Input formats
- Claude Opus 5.5
- textimagefile
- Mistral Medium 3.5
- textimagefile
Output formats
- Claude Opus 5.5
- text
- Mistral Medium 3.5
- text
Pricing & capacity
| Pricing & capacity | Claude Opus 5.5 | Mistral Medium 3.5 |
|---|---|---|
| Input / 1M tokens | $4.00 | $1.50 |
| Output / 1M tokens | $20 | $7.50 |
| Cached input / 1M | $0.20 | Not listed |
| Monthly cost | $180 | $68 |
| Context window | 1M | 262K |
| Maximum output | 128K | 210K |
Input / 1M tokens
- Claude Opus 5.5
- $4.00
- Mistral Medium 3.5
- $1.50
Output / 1M tokens
- Claude Opus 5.5
- $20
- Mistral Medium 3.5
- $7.50
Cached input / 1M
- Claude Opus 5.5
- $0.20
- Mistral Medium 3.5
- Not listed
Monthly cost
- Claude Opus 5.5
- $180
- Mistral Medium 3.5
- $68
Context window
- Claude Opus 5.5
- 1M
- Mistral Medium 3.5
- 262K
Maximum output
- Claude Opus 5.5
- 128K
- Mistral Medium 3.5
- 210K
Benchmarks & performance
| Benchmarks & performance | Claude Opus 5.5 | Mistral Medium 3.5 |
|---|---|---|
| Arena Elo | Not listed | Not listed |
| MMLU-Pro | Not listed | Not listed |
| Intelligence Index | 57.6 | 14.2 |
| GPQA | Not listed | 74.8% |
| Humanity’s Last Exam | 61.4% | 13.8% |
| SciCode | 66.9% | 40.2% |
| Output speed | 91 tokens/s | 166 tokens/s |
| Time to first token | 755.54 s | 2.21 s |
| DesignArena rating | 1,407 | 1,125 |
| DesignArena win rate | 65.3% | 41.1% |
Arena Elo
- Claude Opus 5.5
- Not listed
- Mistral Medium 3.5
- Not listed
MMLU-Pro
- Claude Opus 5.5
- Not listed
- Mistral Medium 3.5
- Not listed
Intelligence Index
- Claude Opus 5.5
- 57.6
- Mistral Medium 3.5
- 14.2
GPQA
- Claude Opus 5.5
- Not listed
- Mistral Medium 3.5
- 74.8%
Humanity’s Last Exam
- Claude Opus 5.5
- 61.4%
- Mistral Medium 3.5
- 13.8%
SciCode
- Claude Opus 5.5
- 66.9%
- Mistral Medium 3.5
- 40.2%
Output speed
- Claude Opus 5.5
- 91 tokens/s
- Mistral Medium 3.5
- 166 tokens/s
Time to first token
- Claude Opus 5.5
- 755.54 s
- Mistral Medium 3.5
- 2.21 s
DesignArena rating
- Claude Opus 5.5
- 1,407
- Mistral Medium 3.5
- 1,125
DesignArena win rate
- Claude Opus 5.5
- 65.3%
- Mistral Medium 3.5
- 41.1%
Tools & features
| Tools & features | Claude Opus 5.5 | Mistral Medium 3.5 |
|---|---|---|
| Function calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Built-in web search | Not listed | Not listed |
| Log probabilities | Not listed | Not listed |
| Deterministic seed | Not listed | Supported |
| Parallel tool calls | Not listed | Not listed |
| Prompt caching | Supported | Not listed |
Function calling
- Claude Opus 5.5
- Supported
- Mistral Medium 3.5
- Supported
Structured outputs
- Claude Opus 5.5
- Supported
- Mistral Medium 3.5
- Supported
JSON mode
- Claude Opus 5.5
- Supported
- Mistral Medium 3.5
- Supported
Reasoning
- Claude Opus 5.5
- Supported
- Mistral Medium 3.5
- Supported
Built-in web search
- Claude Opus 5.5
- Not listed
- Mistral Medium 3.5
- Not listed
Log probabilities
- Claude Opus 5.5
- Not listed
- Mistral Medium 3.5
- Not listed
Deterministic seed
- Claude Opus 5.5
- Not listed
- Mistral Medium 3.5
- Supported
Parallel tool calls
- Claude Opus 5.5
- Not listed
- Mistral Medium 3.5
- Not listed
Prompt caching
- Claude Opus 5.5
- Supported
- Mistral Medium 3.5
- Not listed
API & availability
| API & availability | Claude Opus 5.5 | Mistral Medium 3.5 |
|---|---|---|
| API identifier | claude-opus-5.5 | mistral-medium-3-5 |
| API providers | Not listed | Not listed |
| Knowledge cutoff | Not listed | Not listed |
| Prices checked | Oct 8, 2026 | Oct 8, 2026 |
API identifier
- Claude Opus 5.5
claude-opus-5.5- Mistral Medium 3.5
mistral-medium-3-5
API providers
- Claude Opus 5.5
- Not listed
- Mistral Medium 3.5
- Not listed
Knowledge cutoff
- Claude Opus 5.5
- Not listed
- Mistral Medium 3.5
- Not listed
Prices checked
- Claude Opus 5.5
- Oct 8, 2026
- Mistral Medium 3.5
- 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 & detailsMistral Medium 3.5
Mistral Medium 3.5 is a dense 128B instruction-following model from Mistral AI. It supports text and image inputs with text output, and is designed for agentic workflows, coding, and complex...
Full pricing & detailsComparison FAQ
Claude Opus 5.5: $4.00 input and $20 output per million tokens. Mistral Medium 3.5: $1.50 input and $7.50 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.